Merge branch '6.4' into 7.3

* 6.4:
  Bump Symfony version to 6.4.29
  Update VERSION for 6.4.28
  Update CONTRIBUTORS for 6.4.28
  Update CHANGELOG for 6.4.28
  [Validator] Reviewed and corrected Belarussian translations for the Validator component in the validators.be.xlf file

Author: nicolas-grekas