[TASK] Add PHP 8.4 to test matrix

Author: eliashaeussler

.github/workflows/tests.yml

@@ -6,7 +6,7 @@ jobs:
     runs-on: ubuntu-22.04
     strategy:
       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: Checkout repository
         uses: actions/checkout@v3