Merge branch '4.4' into 5.3

* 4.4: added missing translations for portuguese [#43726] [HttpClient][Mime] Add correct IDN flags for IDNA2008 compliance properly parse quoted strings tagged with !!str do not merge label classes into expanded choice labels [Serializer] PropertyNormalizer - return unique (i.e. filter duplicate ) attributes in extractAttributes function

Author: derrabus

Normalizer/PropertyNormalizer.php

@@ -119,7 +119,7 @@ protected function extractAttributes(object $object, string $format = null, arra
  }
  } while ($reflectionObject = $reflectionObject->getParentClass());
 
- return $attributes;
+ return array_unique($attributes);
  }
 
  /**