Use a different approach to solve the deprecation

Author: Jean85

tests/End2End/App/Kernel.php

@@ -28,6 +28,10 @@ public function registerContainerConfiguration(LoaderInterface $loader): void
     {
         $loader->load(__DIR__ . '/config.yml');
 
+        if (self::VERSION_ID >= 50000) {
+            $loader->load(__DIR__ . '/deprecations_for_5.yml');
+        }
+
         if (interface_exists(MessageBusInterface::class) && self::VERSION_ID >= 40300) {
             $loader->load(__DIR__ . '/messenger.yml');
         }

tests/End2End/App/config.yml

@@ -4,9 +4,7 @@ sentry:
     error_types: E_ALL & ~E_USER_DEPRECATED
 
 framework:
-  router:
-    utf8: true # avoid deprecation
-    resource: "%routing_config_dir%/routing.yml"
+  router: { resource: "%routing_config_dir%/routing.yml" }
   secret: secret
   test: ~
 

tests/End2End/App/deprecations_for_5.yml

@@ -0,0 +1,3 @@
+framework:
+  routing:
+    utf8: true