remove unused dependency

src/Controller/MainController.php

@@ -3,7 +3,6 @@
 namespace App\Controller;
 
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
-use Symfony\Contracts\Translation\TranslatorInterface;
 
 use Symfony\Component\Routing\Annotation\Route;
 use Symfony\Component\HttpFoundation\Response;