[maintainance] cleanup gitlab members of NetworkManager
when NetworkManager migrated to gitlab, several gitlab users were automatically added as Maintainers of NetworkManager project (https://gitlab.freedesktop.org/groups/NetworkManager/-/group_members).
I'd like to clean this up, to have more control over the list of people that are registered as "Maintainer".
So, this is a friendly notification, that I will mess with the membership configuration on gitlab. If you think I am doing anything wrong, please say so. This configuration can be changed easily.