Adds missing use statement

Author: silasjoisten

routing.rst

@@ -969,6 +969,7 @@ optional ``priority`` parameter in those routes to control their priority:
         namespace App\Controller;
 
         use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
+        use Symfony\Component\HttpFoundation\Response;
         use Symfony\Component\Routing\Attribute\Route;
 
         class BlogController extends AbstractController