fix(ci): use testbench ^9.14 for Laravel 11 compatibility

Changed from ^9.0 to ^9.14 to avoid dependency conflicts with Pest 4.0.
Testbench 9.0.0 has conflicts with nunomaduro/collision and phpunit versions.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: sylvesterdamgaard

.github/workflows/run-tests.yml

@@ -28,7 +28,7 @@ jobs:
           - laravel: 12.*
             testbench: ^10.6
           - laravel: 11.*
-            testbench: ^9.0
+            testbench: ^9.14
 
     name: P${{ matrix.php }} - L${{ matrix.laravel }} - ${{ matrix.stability }} - ${{ matrix.os }}
 
@@ -77,7 +77,7 @@ jobs:
           - laravel: 12.*
             testbench: ^10.6
           - laravel: 11.*
-            testbench: ^9.0
+            testbench: ^9.14
 
     name: Redis Integration - P${{ matrix.php }} - L${{ matrix.laravel }}