Revert to actions/checkout v4 (#2018)

Author: cqc-alec

.github/workflows/build-without-conan.yml

@@ -14,7 +14,7 @@ jobs:
       INSTALL_DIR: "/home/runner/local"
       TMP_DIR: "/home/runner/tmp"
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
     - name: Create directories
       run: |
         mkdir ${INSTALL_DIR}

.github/workflows/build_and_test.yml

@@ -28,7 +28,7 @@ jobs:
       pytket_or_workflow_changed: ${{ steps.filter.outputs.pytket_or_workflow }}
       tket_ver: ${{ steps.tket_ver.outputs.tket_ver }}
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
     - name: Select Python 3.12
       uses: actions/setup-python@v5
       with:
@@ -82,7 +82,7 @@ jobs:
     if: needs.check_changes.outputs.tket_or_workflow_changed == 'true' || needs.check_changes.outputs.doxyfile_or_workflow_changed == 'true'
     runs-on: 'ubuntu-24.04'
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v4
       - name: Check doxygen
         run: |
           sudo apt install -y doxygen graphviz
@@ -92,7 +92,7 @@ jobs:
     name: Check C++ code formatting
     runs-on: 'macos-latest'
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v4
       - name: Check C++ code formatting
         run: |
           brew update
@@ -109,7 +109,7 @@ jobs:
         os: ['ubuntu-24.04', 'macos-13', 'macos-15']
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
     - name: apt update
       if: matrix.os == 'ubuntu-24.04'
       run: sudo apt update
@@ -166,7 +166,7 @@ jobs:
         os: ['windows-2025']
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v4
       - name: Select Python 3.12
         uses: actions/setup-python@v5
         with:
@@ -253,7 +253,7 @@ jobs:
     if: needs.check_changes.outputs.tket_or_workflow_changed == 'true' || needs.check_changes.outputs.pytket_or_workflow_changed == 'true'
     runs-on: ubuntu-24.04
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
       with: 
         submodules: recursive
     - name: Select Python 3.12
@@ -357,7 +357,7 @@ jobs:
         os: ['macos-13', 'macos-15']
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
     - name: Select Python 3.12
       uses: actions/setup-python@v5
       with:
@@ -436,7 +436,7 @@ jobs:
     if: needs.check_changes.outputs.tket_or_workflow_changed == 'true' || needs.check_changes.outputs.pytket_or_workflow_changed == 'true'
     runs-on: windows-2025
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
     - name: Select Python 3.12
       uses: actions/setup-python@v5
       with:
@@ -552,7 +552,7 @@ jobs:
     if: github.event_name == 'push'
     runs-on: ubuntu-24.04
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
       with:
         ref: gh-pages
     - name: Download artefact
@@ -580,7 +580,7 @@ jobs:
     if: github.event_name == 'pull_request' || github.event_name == 'workflow_dispatch'
     runs-on: ubuntu-24.04
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
     - name: Download artefact
       uses: actions/download-artifact@v5
       with:

.github/workflows/build_libs.yml

@@ -19,7 +19,7 @@ jobs:
       tkwsm: ${{ steps.filter.outputs.tkwsm }}
       libs: ${{ steps.filter.outputs.changes }}
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
     - uses: dorny/paths-filter@v3.0.2
       id: filter
       with:
@@ -51,7 +51,7 @@ jobs:
         build_type: ['Release', 'Debug']
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
     - name: normalize line endings in conanfile and src directory
       if: matrix.os == 'windows-2025'
       # This is necessary to ensure consistent revisions across platforms.
@@ -104,7 +104,7 @@ jobs:
     env:
       UPLOAD_PACKAGE: "NO"
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
     - name: set up container
       run: |
         docker create --name linux_build -i -v /:/host quay.io/pypa/manylinux_2_28_x86_64:latest /bin/bash

.github/workflows/coverage.yml

@@ -23,7 +23,7 @@ jobs:
     outputs:
       tket: ${{ steps.filter.outputs.tket }}
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
     - uses: dorny/paths-filter@v3.0.2
       id: filter
       with:
@@ -39,7 +39,7 @@ jobs:
     if: needs.changes.outputs.tket == 'true' || github.event_name == 'schedule'
     runs-on: ubuntu-24.04
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
     - name: Select Python 3.12
       uses: actions/setup-python@v5
       with:
@@ -97,7 +97,7 @@ jobs:
     if: ((github.event_name == 'pull_request' || github.event_name == 'workflow_dispatch') && needs.changes.outputs.tket == 'true') || github.event_name == 'schedule'
     runs-on: ubuntu-24.04
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
     - name: Download artefact
       uses: actions/download-artifact@v5
       with:
@@ -121,7 +121,7 @@ jobs:
     if: github.event_name == 'push' && needs.changes.outputs.tket == 'true'
     runs-on: ubuntu-24.04
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
       with:
         ref: gh-pages
     - name: Download artefact
@@ -150,7 +150,7 @@ jobs:
     if: github.event_name == 'schedule'
     runs-on: ubuntu-24.04
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
       with:
         ref: gh-pages
     - name: Download artefact

.github/workflows/docs.yml

@@ -11,7 +11,7 @@ jobs:
   build_docs:
     runs-on: ubuntu-24.04
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
     - name: Install Doxygen
       run: sudo apt update && sudo apt install -y doxygen graphviz
     - name: Build Doxygen docs
@@ -26,7 +26,7 @@ jobs:
     concurrency: gh_pages
     runs-on: ubuntu-24.04
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
       with:
         ref: gh-pages
     - name: Download artefact

.github/workflows/lint.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
     - name: Set up Python 3.x
       uses: actions/setup-python@v5
       with:

.github/workflows/pytket_benchmarking.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: macos-14
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
       with:
         fetch-depth: '0'
 
@@ -77,7 +77,7 @@ jobs:
           pip list
 
       - name: Checkout pytket-benchmarking-store
-        uses: actions/checkout@v5
+        uses: actions/checkout@v4
         with:
           repository: CQCL/pytket-benchmarking-store
           path: pytket-benchmarking-store

.github/workflows/release.yml

@@ -16,7 +16,7 @@ jobs:
       matrix:
         python3-version: ['10', '11', '12']
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
       with:
         fetch-depth: '0'
     - run: git fetch --depth=1 origin +refs/tags/*:refs/tags/*
@@ -43,7 +43,7 @@ jobs:
       matrix:
         python3-version: ['10', '11', '12']
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
       with:
         fetch-depth: '0'
     - run: git fetch --depth=1 origin +refs/tags/*:refs/tags/*
@@ -69,7 +69,7 @@ jobs:
       matrix:
         python-version: ['3.10', '3.11', '3.12']
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
       with:
         fetch-depth: '0'
     - run: git fetch --depth=1 origin +refs/tags/*:refs/tags/*
@@ -111,7 +111,7 @@ jobs:
       matrix:
         python-version: ['3.10', '3.11', '3.12']
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
       with:
         fetch-depth: '0'
     - run: git fetch --depth=1 origin +refs/tags/*:refs/tags/*
@@ -151,7 +151,7 @@ jobs:
       matrix:
         python-version: ['3.10', '3.11', '3.12']
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
       with:
         fetch-depth: '0'
     - run: git fetch --depth=1 origin +refs/tags/*:refs/tags/*
@@ -209,7 +209,7 @@ jobs:
           path: wheelhouse/
       - name: Install wheel
         run: pip install wheelhouse/pytket-*.whl
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v4
         with:
           path: tket
       - name: Setup tests
@@ -227,7 +227,7 @@ jobs:
       matrix:
         python3-version: ['10', '11', '12', '13']
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
       with:
         path: tket
     - name: Set up Python 3.${{ matrix.python3-version }}
@@ -248,7 +248,7 @@ jobs:
         path: wheelhouse/
     - name: Install wheel
       run: pip install wheelhouse/pytket-*.whl
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
       with:
         path: tket
     - name: Setup tests
@@ -283,7 +283,7 @@ jobs:
       with:
         name: MacOS_x86_3.12_wheel
         path: wheelhouse/
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
       with:
         path: tket
     - name: Install wheel
@@ -320,7 +320,7 @@ jobs:
       with:
         name: MacOS_arm64_3.12_wheel
         path: wheelhouse/
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
       with:
         path: tket
     - name: Install wheel
@@ -359,7 +359,7 @@ jobs:
     - name: Install wheel
       shell: bash
       run: for i in wheelhouse/pytket-*.whl ; do pip install $i ; done
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
       with:
           path: tket
     - name: Run tests

.github/workflows/test_libs.yml

@@ -19,7 +19,7 @@ jobs:
       tkrng: ${{ steps.filter.outputs.tkrng }}
       libs: ${{ steps.filter.outputs.changes }}
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
     - uses: dorny/paths-filter@v3.0.2
       id: filter
       with:
@@ -67,7 +67,7 @@ jobs:
         lib: ${{ fromJson(needs.set_libs_matrix.outputs.libs) }}
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
     - name: Select Python 3.12
       uses: actions/setup-python@v5
       with:
@@ -102,7 +102,7 @@ jobs:
         lib: ${{ fromJson(needs.set_libs_matrix.outputs.libs) }}
     runs-on: 'ubuntu-24.04'
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
     - name: Select Python 3.12
       uses: actions/setup-python@v5
       with:
@@ -157,7 +157,7 @@ jobs:
     concurrency: gh_pages
     runs-on: ubuntu-24.04
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
       with:
         ref: gh-pages
     - name: download artefact

.github/workflows/test_libs_all.yml

@@ -14,7 +14,7 @@ jobs:
         lib: ['tklog', 'tkassert', 'tkrng', 'tktokenswap', 'tkwsm']
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
     - name: Select Python 3.12
       uses: actions/setup-python@v5
       with: