Merge branch '6.4' into 7.0

* 6.4:
  [Messenger] Fix requiring symfony/deprecation-contracts
  [AssetMapper] Warn of missing or incompat dependencies
  Added missing Uzbek translations.
  [Messenger] [Sqs] Add `AddFifoStamp` middleware
  DX: nullable_type_declaration
  [HtmlSanitizer] Add support for sanitizing unlimited length of HTML document
  [Validator] Add missing Finnish translations
  [FrameworkBundle][Routing][Translation][Workflow] Move some compiler passes from FrameworkBundle to components

Author: nicolas-grekas