Fix Windows shell escaping for Pest 4 require step

Author: freekmurze

.github/workflows/run-tests.yml

@@ -50,6 +50,7 @@ jobs:
 
       - name: Require Pest 4 for Laravel 13
         if: matrix.laravel == '13.*'
+        shell: bash
         run: composer require "pestphp/pest:^4.0" "pestphp/pest-plugin-laravel:^4.0" --dev --no-interaction --no-update
 
       - name: Install dependencies