Description of the problem, including code/CLI snippet

https://docs.gitlab.com/ce/api/container_registry.html#delete-registry-repository-tags-in-bulk indicates that the parametername_regex seems to be now deprecated in favour ofname_regex_keep andname_regex_delete. These two parameters seem to be currently unsupported by the code.

This seems to be defined herehttps://github.com/python-gitlab/python-gitlab/blob/master/gitlab/v4/objects/__init__.py#L1849