[CI] Streamline GitHub workflow configuration for tests (#368)

- The strategy option is removed. This is superfluous as no build matrix is defined.
- The actions/checkout action is updated to version 4.

Releases: main, 12.4

.github/workflows/tests.yml

@@ -8,15 +8,11 @@ jobs:
  testsuite:
  name: all tests
  runs-on: ubuntu-latest
- strategy:
- # This prevents cancellation of matrix job runs, if one or more already failed
- # and let the remaining matrix jobs be executed anyway.
- fail-fast: false
  env:
  php: '8.1'
  steps:
  - name: Checkout
- uses: actions/checkout@v3
+ uses: actions/checkout@v4
 
  - name: Install testing system
  run: Build/Scripts/runTests.sh -p ${{ env.php }} -s composerUpdate