Update actions/checkout action to v4 (#19)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/quality-assurance.yml

@@ -14,7 +14,7 @@ jobs:
       matrix:
         php-version: [8.2, 8.3]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: shivammathur/setup-php@v2
         with:
           php-version: ${{ matrix.php-version }}