ci: laravel 11 doesn't support php 8.1

Author: xel1045

.github/workflows/tests.yml

@@ -12,6 +12,9 @@ jobs:
         php: [8.1, 8.2]
         laravel: [10.*, 11.*]
         dependency-version: [prefer-lowest, prefer-stable]
+        exclude:
+          - php: 8.1
+            laravel: 11.*
         include:
           - laravel: 10.*
             testbench: 8.*