[ci] test against symfony 7

Author: jrushlow

.github/workflows/ci.yaml

@@ -3,7 +3,7 @@ name: CI
 on:
     push:
         branches:
-            - master
+            - main 
     pull_request:
     release:
 
@@ -15,7 +15,7 @@ jobs:
             matrix:
                 php: [ 8.1, 8.2, 8.3 ]
                 deps: [ highest ]
-                symfony: [ 5.4.*, 6.3.*, 6.4.* ]
+                symfony: [ 5.4.*, 6.3.*, 6.4.*, 7.0.*, 7.1.* ]
                 include:
                     - php: 8.1
                       deps: lowest