fix(state): remove resource_class change (#6607)

Author: soyuka

src/State/Processor/SerializeProcessor.php

@@ -52,11 +52,6 @@ public function process(mixed $data, Operation $operation, array $uriVariables =
         $context['original_data'] = $data;
 
         $class = $operation->getClass();
-        if ($request->attributes->get('_api_resource_class') && $request->attributes->get('_api_resource_class') !== $operation->getClass()) {
-            $class = $request->attributes->get('_api_resource_class');
-            trigger_deprecation('api-platform/core', '3.3', 'The resource class on the router is not the same as the operation\'s class which leads to wrong behaviors. Prefer using "stateOptions" if you need to change the entity class.');
-        }
-
         $serializerContext = $this->serializerContextBuilder->createFromRequest($request, true, [
             'resource_class' => $class,
             'operation' => $operation,