Add PHP 8.4 to workflow

Author: bobvandevijver

.github/workflows/test.yaml

@@ -17,7 +17,7 @@ jobs:
     continue-on-error: false
     strategy:
       matrix:
-        php-version: ['8.1', '8.2', '8.3']
+        php-version: ['8.1', '8.2', '8.3', '8.4']
     steps:
       - name: 'Checkout code'
         uses: actions/checkout@v4