Use config file instead of attribute or annotation

config/routes.php

@@ -0,0 +1,12 @@
+<?php
+
+use Symfony\Component\Routing\Loader\Configurator\RoutingConfigurator;
+use Terminal42\NotificationCenterBundle\BulkyItem\BulkyItemStorage;
+use Terminal42\NotificationCenterBundle\Controller\DownloadBulkyItemController;
+
+return function (RoutingConfigurator $routes): void {
+    $routes->add('nc_bulky_item_download', '/notifications/download/{voucher}')
+        ->controller(DownloadBulkyItemController::class)
+        ->requirements(['voucher' => BulkyItemStorage::VOUCHER_REGEX])
+    ;
+};

src/ContaoManager/Plugin.php

@@ -28,8 +28,8 @@ public function getBundles(ParserInterface $parser): array
     public function getRouteCollection(LoaderResolverInterface $resolver, KernelInterface $kernel)
     {
         return $resolver
-            ->resolve(DownloadBulkyItemController::class)
-            ->load(DownloadBulkyItemController::class)
+            ->resolve(__DIR__.'/../../config/routes.php')
+            ->load(__DIR__.'/../../config/routes.php')
         ;
     }
 }

src/Controller/DownloadBulkyItemController.php

@@ -9,14 +9,8 @@
 use Symfony\Component\HttpFoundation\StreamedResponse;
 use Symfony\Component\HttpFoundation\UriSigner;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
-use Symfony\Component\Routing\Annotation\Route;
 use Terminal42\NotificationCenterBundle\BulkyItem\BulkyItemStorage;
 
-/**
- * Do not use PHP attribute for compatibility with Contao 4.13/Symfony 5.4.
- *
- * @Route("/notifications/download/{voucher}", name="nc_bulky_item_download", requirements={"voucher"=BulkyItemStorage::VOUCHER_REGEX})
- */
 class DownloadBulkyItemController
 {
     public function __construct(