Add PHP 8.4 to the Github actions to start testing.

Author: tvbeek

.github/workflows/tests.yml

@@ -11,7 +11,7 @@ jobs:
 
     strategy:
       matrix:
-        php: ['7.4', '8.0', '8.1', '8.2', '8.3']
+        php: ['7.4', '8.0', '8.1', '8.2', '8.3', '8.4']
 
     steps:
       - name: Checkout Code