Update thrown error code to 404.

I overlooked the behat test which fails since I didn't update the error
code which is thrown by the exception.

Author: Taminoful

src/Bridge/RamseyUuid/Identifier/Normalizer/UuidNormalizer.php

@@ -36,7 +36,7 @@ public function denormalize($data, $class, $format = null, array $context = [])
         try {
             return Uuid::fromString($data);
         } catch (InvalidUuidStringException $e) {
-            throw new NotNormalizableValueException('Not found, because of an invalid identifier format', $e->getCode(), $e);
+            throw new NotNormalizableValueException('Not found, because of an invalid identifier format', 404, $e);
         }
     }