Remove PHP 8.1 from GitHub workflow because of incompatibility

Author: Seros

.github/workflows/symfony.yml

@@ -18,7 +18,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        php-versions: ['8.1', '8.2', '8.3', '8.4']
+        php-versions: ['8.2', '8.3', '8.4']
     steps:
       - name: Checkout
         uses: actions/checkout@v3