Bump actions/checkout from 4 to 5 (#31)

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>

Author: dependabot[bot]

.github/workflows/php.yml

@@ -14,7 +14,7 @@ jobs:
       matrix:
         php-version: ['7.4', '8.0', '8.1', '8.2', '8.3']
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Use PHP ${{ matrix.php-version }}
       uses: shivammathur/setup-php@v2
       with:
@@ -31,7 +31,7 @@ jobs:
     runs-on: ubuntu-latest
     name: PHPStan
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Use PHP 8.3
       uses: shivammathur/setup-php@v2
       with: