Updated unit test (#4619)

Author: sreichel

.github/workflows/phpunit.yml

@@ -14,8 +14,8 @@ jobs:
     strategy:
       matrix:
         operating-system: [ubuntu-latest]
-        php-versions: ['7.4', '8.3']
-        mysql-version: ['5.7', '8.0']
+        php-versions: ['7.4', '8.4']
+        mysql-version: ['5.7', '8.0', '8.4']
 
     services:
       mysql: