Merge branch '6.1' into 6.2

* 6.1:
  [Security][Serializer] Add missing args to trigger_deprecation
  Added  Urdu Language Translation in Form Component, Security Core and in Validator Component
  Merge upgrade notes for Serializer component
  Throw LogicException instead of Error when trying to generate logout-URL without request
  [Intl] Update the ICU data to 72.1 - 5.4
  [Notifier] Update README for FreeMobile

Author: fabpot