Revert php version on unit tests

Author: tijmenbruggeman

.github/workflows/check-test.yml

@@ -33,7 +33,7 @@ jobs:
     timeout-minutes: 10
     strategy:
       matrix:
-        php: ['5.6', '8.2']
+        php: ['7.4']
     steps:
       - name: Checkout Code
         uses: actions/checkout@v3