Test against PHP 8.4 (#1642)

Author: jderusse

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       max-parallel: 10
       matrix:
-        php: ['7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3']
+        php: ['7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3', '8.4']
 
     steps:
       - name: Set up PHP