Remove incompatible PHP / Laravel combinations from test matrix

Author: Zain Mehdi

.github/workflows/test.yaml

@@ -37,6 +37,12 @@ jobs:
             php: 7.1
           - laravel: 8.*
             php: 7.2
+          # Laravel 6 only support PHP <=8.0
+          - laravel: 6.*
+              php: 8.1
+          # Laravel 7 only support PHP <=8.0
+          - laravel: 7.*
+              php: 8.1
 
 
     name: PHP ${{ matrix.php }} - Laravel ${{ matrix.laravel }}