Exclude php 7.2 for L8 tests

Author: AlexVanderbist

.github/workflows/run-tests.yml

@@ -21,6 +21,9 @@ jobs:
             testbench: 4.*
           - laravel: 5.8.*
             testbench: 3.8.*
+        exlude:
+          - laravel: 8.*
+            php: 7.2
 
     name: P${{ matrix.php }} - L${{ matrix.laravel }} - ${{ matrix.dependency-version }}