Fix PHP version mismatch

Author: JeroenDeDauw

.github/workflows/unit-test.yml

@@ -11,7 +11,7 @@ on:
 jobs:
   tests:
     runs-on: ubuntu-latest
-    name: "Running on PHP 8.2"
+    name: "Running on PHP 8.1"
 
     steps:
       - uses: actions/checkout@v2