ci: add Laravel 11 support to GitHub Actions workflow.*

- Remove duplicate job with Laravel10.* and Testbench 8.*

.github/workflows/test.yml

@@ -15,9 +15,11 @@ jobs:
             matrix:
                 os: [ ubuntu-latest ]
                 php: [8.1,8.2]
-                laravel: [ 10.*]
+                laravel: [10.*,11.*]
                 dependency-version: [ prefer-stable ]
                 include:
+                    - laravel: 11.*
+                      testbench: 9.*
                     - laravel: 10.*
                       testbench: 8.*