Adjust php versions

Author: laurynas

.github/workflows/main.yml

@@ -9,7 +9,7 @@ jobs:
           - '5.6'
           - '7.0'
           - '7.4'
-          - '8.1'
+          - '8.0'
     name: PHP ${{ matrix.php-version }} sample
     steps:
       - uses: actions/checkout@v3