Description of the problem, including code/CLI snippet

When attributes disappear from an object on the serverRefreshMixin.refresh() doesn't remove them.

For instance if a job that has artifacts will have anartifacts_file attribute. If you call.delete_artifacts() on it, then call.refresh() theartifacts_file attribute will still be there.

# get a job with artifactsjob = project.jobs.get(job_id)# will succeedassert hasattr(job,"artifacts_file")# now delete the artifacts from the serverjob.delete_artifacts()# This will fail because the artifacts_file is still there; refresh() didn't remove itjob.refresh()assert not hasattr(job,"artifacts_file")# If you get the job again from the project it'll be finejob = project.jobs.get(job_id)assert not hasattr(job,"artifacts_file")

Expected Behavior

I would expect that the attributes dict on any object should be exactly the same between a freshly retrieved object and an old object after calling.refresh()

o.refresh()# After a refresh this should always be trueo.attributes==o.manager.get(o.id).attributes

Actual Behavior

They're not equal

Specifications

• python-gitlab version:v2.4.0
• API version you are using (v3/v4):v4
• Gitlab server version (or gitlab.com):13.2.3