github-actions: bump actions/checkout from 4 to 5 in the all group (#19)

Bumps the all group with 1 update: [actions/checkout](https://github.com/actions/checkout).


Updates `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
  dependency-group: all
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     name: PHP ${{ matrix.php }} - ${{ matrix.prefer-lowest == 1 && 'Lowest' || 'Latest' }} Dependencies
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - uses: RevoTale/php-composer-testing-action@v1
       with:
         php-version: ${{ matrix.php }}
@@ -25,7 +25,7 @@ jobs:
   PHPMD:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - uses: RevoTale/php-composer-testing-action@v1
       with:
         php-version: 8.4
@@ -35,7 +35,7 @@ jobs:
   Rector:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - uses: RevoTale/php-composer-testing-action@v1
       with:
         php-version: 8.4
@@ -45,7 +45,7 @@ jobs:
   PHPStan:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - uses: RevoTale/php-composer-testing-action@v1
       with:
         php-version: 8.4