chore: only runs CI against stable

Author: nunomaduro

.github/workflows/tests.yml

@@ -15,7 +15,7 @@ jobs:
         os: [ubuntu-latest, macos-latest, windows-latest]
         symfony: ['7.1']
         php: ['8.2', '8.3', '8.4']
-        dependency_version: [prefer-lowest, prefer-stable]
+        dependency_version: [prefer-stable]
 
     name: PHP ${{ matrix.php }} - Symfony ^${{ matrix.symfony }} - ${{ matrix.os }} - ${{ matrix.dependency_version }}