Add PHP 8.5 and Symfony 8 to CI

Author: andrewmy

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
     name: PHP ${{ matrix.php }} tests
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: shivammathur/setup-php@v2
         with: