Exclude incompatible combinations from matrix

.github/workflows/run-tests.yaml

@@ -25,6 +25,8 @@ jobs:
         exclude:
           - laravel: 8.*
             php: 8.2
+          - laravel: 8.*
+            php: 8.3
           - laravel: 10.*
             php: 8.0
     name: PHP ${{ matrix.php }} - Laravel ${{ matrix.laravel }}