Use gitlab-shell maintainers group instead for CODEOWNERS
This MR updates the CODEOWNERS
file to use the @gitlab-org/maintainers/gitlab-shell
group instead of specific members.
Members can be viewed/managed via https://gitlab.com/groups/gitlab-org/maintainers/gitlab-shell/-/group_members?with_inherited_permissions=exclude.
Related: #652 (closed)
Edited by Ash McKenzie