build(deps): bump actions/checkout from 4 to 5 (#419)

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 5.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Michael Mainer <[email protected]>

Author: dependabot[bot]

.github/workflows/pr-validation.yml

@@ -25,7 +25,7 @@ jobs:
       uses: shivammathur/setup-php@v2
       with:
         php-version: ${{ matrix.php-versions }}
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Composer validate
       run: |
         composer validate

.github/workflows/release-please-gha.yml

@@ -19,7 +19,7 @@ jobs:
   release:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Generate GitHub App token
         id: app-token