Merge branch '5.4' into 6.0

* 5.4:
  cs fix
  [Messenger] Fix Doctrine transport on MySQL
  [Filesystem] Remove needless `mb_*` calls
  [Translator] Fix translator overlapse
  [Yaml] Improve test coverage in DumperTest and ParserTest
  Extract dispatching console signal handling and include subscribers
  [Mailer] Fix error message in case of an STMP error
  [HttpClient] Fix shared connections not being freed on PHP < 8
  [HttpFoundation] Fix invalid ID not regenerated with native PHP file sessions
  [HttpClient] Fix memory leak when using StreamWrapper
  minor: fix test
  [Serializer] Fix error message
  remove the ChatterInterface alias when the chatter service is removed
  Bump Symfony version to 5.4.12
  Update VERSION for 5.4.11
  Update CHANGELOG for 5.4.11
  Bump Symfony version to 4.4.45
  Update VERSION for 4.4.44
  Update CONTRIBUTORS for 4.4.44
  Update CHANGELOG for 4.4.44

Author: nicolas-grekas