Also test on 8.4

Author: danog

.github/workflows/integrate.yaml

@@ -21,6 +21,7 @@ jobs:
           - 8.1
           - 8.2
           - 8.3
+          - 8.4
 
         dependencies:
           - highest
@@ -68,6 +69,7 @@ jobs:
           - 8.1
           - 8.2
           - 8.3
+          - 8.4
 
         symfony-version:
           - 6