Add Symfony 8.1 to test workflow

Author: SenseException

.github/workflows/tests.yml

@@ -16,9 +16,12 @@ jobs:
           - '6.4.*'
           - '7.4.*'
           - '8.0.*'
+          - '8.1.*'
         exclude:
           - symfony: '8.0.*'
             php-versions: '8.3'
+          - symfony: '8.1.*'
+            php-versions: '8.3'
 
     steps:
     - uses: "actions/checkout@v6"