bugfixes:
  - "mysql_user - fix logic when ``update_password`` is set to ``on_create`` for users using ``plugin*`` arguments (https://github.com/ansible-collections/community.mysql/issues/334). The ``on_create`` sets ``password`` to None for old mysql_native_authentication but not for authentiation methods which uses the ``plugin*`` arguments. This PR changes this so ``on_create`` also exchange ``plugin``, ``plugin_hash_string``, ``plugin_auth_string`` to None in the list of arguments to change"