[minor] support Symfony 6.1 (#267)

Author: kbond

.github/workflows/ci.yml

@@ -46,6 +46,9 @@ jobs:
           - php: 8.1
             symfony: 6.0.*
             deps: highest
+          - php: 8.1
+            symfony: 6.1.*
+            deps: highest
     steps:
       - name: Checkout code
         uses: actions/[email protected]