Bump actions/checkout from 4 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/R-CMD-check.yaml

@@ -43,7 +43,7 @@ jobs:
       PRECOMMIT_INSTALLATION_METHOD: ${{ matrix.config.installation_method }}
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - uses: r-lib/actions/setup-r@v2
         with:

.github/workflows/end-to-end.yml

@@ -15,7 +15,7 @@ jobs:
 
       - uses: r-lib/actions/setup-r@v2
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Query dependencies
         run: |

.github/workflows/hook-dependencies-update.yml

@@ -12,7 +12,7 @@ jobs:
     env:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - uses: r-lib/actions/setup-r@v2
         with:
@@ -47,7 +47,7 @@ jobs:
             [1]: https://github.com/peter-evans/create-pull-request
       - name: Checkout PR head SHA
         if: steps.cpr.outputs['pull-request-operation'] != 'none'
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           ref: ${{ steps.cpr.outputs['pull-request-head-sha'] }}
           fetch-depth: 0  # good practice if you need history

.github/workflows/hook-tests.yaml

@@ -24,7 +24,7 @@ jobs:
 
     steps:
       - uses: r-lib/actions/setup-pandoc@v2
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: r-lib/actions/setup-r@v2
         with:
           r-version: ${{ matrix.config.r }}

.github/workflows/pkgdown.yaml

@@ -20,7 +20,7 @@ jobs:
     env:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - uses: r-lib/actions/setup-pandoc@v2