Add PHP 8.4 to CI matrix (#1639)

Co-authored-by: Ruud Kamphuis <[email protected]>

Author: simPod

.github/workflows/test.yml

@@ -21,6 +21,7 @@ jobs:
           - "8.1"
           - "8.2"
           - "8.3"
+          - "8.4"
         dependencies:
           - highest
         include: