Add more PHP version to the test matrix

Author: benedikt

.github/workflows/test.yml

@@ -4,7 +4,7 @@ jobs:
   build:
     strategy:
       matrix:
-        php: ['7.3', '7.4', '8.0', '8.1']
+        php: ["7.3", "7.4", "8.0", "8.1", "8.2", "8.3", "8.4"]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2