[format] Use AlignFunctionDeclarations from clang-format 20.1.0

.clang-format

@@ -3,7 +3,11 @@ AccessModifierOffset: -3
 AlignAfterOpenBracket: Align
 AlignConsecutiveAssignments: None
 # This would be nice to have but seems to also (mis)align function parameters
-AlignConsecutiveDeclarations: None
+# AlignFunctionDeclarations: true
+AlignConsecutiveDeclarations:
+  Enabled: true
+  # Part of clang-format 20.1.0
+  AlignFunctionDeclarations: true
 AlignEscapedNewlines: Left
 AlignOperands:   true
 AlignTrailingComments: true

.github/workflows/code_analysis.yml

@@ -37,9 +37,16 @@ jobs:
     - name: Determine merge base
       run: echo "MERGE_BASE=$(git merge-base ${{ github.event.pull_request.base.sha }} HEAD)" >> $GITHUB_ENV
     - name: install clang-format
-      run: sudo apt-get install -y clang-format
+      run: |
+         wget https://apt.llvm.org/llvm.sh
+         chmod u+x ./llvm.sh
+         sudo ./llvm.sh 20
+         sudo apt-get install -y clang-format-20
+         PATH=/usr/lib/llvm-20/bin:${PATH}
     - name: run clang-format script
-      run: .ci/format_script.sh
+      run: |
+        PATH=/usr/lib/llvm-20/bin:${PATH}
+        .ci/format_script.sh
 
   ruff:
     if: |