Bump actions/checkout from 4 to 6 (#2047)

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](https://github.com/actions/checkout/compare/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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/ci-checks.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: .ruby-version
@@ -33,7 +33,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: .ruby-version

.github/workflows/publish-image.yml

@@ -39,7 +39,7 @@ jobs:
       IMAGE_NAME: ${{ github.repository }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v5.0.0
+        uses: actions/checkout@v6
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3.11.1

.github/workflows/test.yml

@@ -56,7 +56,7 @@ jobs:
       - name: Install system packages
         run: sudo apt-get update && sudo apt-get install --no-install-recommends -y libsqlite3-0 libvips curl ffmpeg
 
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: ruby/setup-ruby@v1
         with: