fix matrix exclusion for Laravel 11

Author: michaeldyrynda

.github/workflows/run-tests.yml

@@ -16,7 +16,7 @@ jobs:
         php: [8.3, 8.2, 8.1]
         laravel: ['^10.0', '^11.0']
         exclude:
-          - laravel: '11.0'
+          - laravel: '^11.0'
             php: 8.1
 
     name: P${{ matrix.php }} - L${{ matrix.laravel }}