Description of the problem, including code/CLI snippet

ProjectMember.save() does not work because 'ProjectMemberAllManager' object has no attribute 'update'.

project = GitlabClient().projects.get('my_proj_name')
member = project.members.list()[0]
member.access_level = 30
member.save()

Expected Behavior

Member saves with new properties.
Actual Behavior

Traceback (most recent call last):
  File "gitlab_client.py", line 85, in update_project_permissions
    member.save()
  File "/Users/theoturner/Library/Python/3.8/lib/python/site-packages/gitlab/mixins.py", line 551, in save
    server_data = self.manager.update(obj_id, updated_data, **kwargs)
AttributeError: 'ProjectMemberAllManager' object has no attribute 'update'

N.B. type(member) is <class 'gitlab.v4.objects.members.ProjectMember'> so I haven't accidentally got a ProjectMemberAllManager.
Specifications

python-gitlab version: 3.0.0, can be replicated in 2.8 and above
API version you are using (v3/v4): v4

Note: John Villalovos accidentally edited this and now attempting to return to original state...