Updated checkout action [skip ci]

Author: ankane

.github/workflows/build.yml

@@ -11,7 +11,7 @@ jobs:
             composer: --prefer-lowest
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: shivammathur/setup-php@v2
         with:
           php-version: ${{ matrix.php }}