[Serializer] Remove unused variable

Author: mttsch

src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php

@@ -1053,7 +1053,7 @@ private function updateData(array $data, string $attribute, mixed $attributeValu
      */
     private function isMaxDepthReached(array $attributesMetadata, string $class, string $attribute, array &$context): bool
     {
-        if (!($enableMaxDepth = $context[self::ENABLE_MAX_DEPTH] ?? $this->defaultContext[self::ENABLE_MAX_DEPTH] ?? false)
+        if (!($context[self::ENABLE_MAX_DEPTH] ?? $this->defaultContext[self::ENABLE_MAX_DEPTH] ?? false)
             || !isset($attributesMetadata[$attribute]) || null === $maxDepth = $attributesMetadata[$attribute]?->getMaxDepth()
         ) {
             return false;