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

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);
     }
 
     /**