fix(hydra): update UrlGeneratorInterface namespace

Author: aegypius

src/Hydra/Serializer/ConstraintViolationListNormalizer.php

@@ -13,7 +13,7 @@
 
 namespace ApiPlatform\Hydra\Serializer;
 
-use ApiPlatform\Api\UrlGeneratorInterface;
+use ApiPlatform\Metadata\UrlGeneratorInterface;
 use ApiPlatform\Serializer\AbstractConstraintViolationListNormalizer;
 use Symfony\Component\Serializer\NameConverter\NameConverterInterface;