fix: do not list GMT as a meeting time option (#8507)

[bkmgit]

Fixes #8507

[jennifer-richards]

This looks good, but we should have a migration to update meetings currently using GMT to use UTC instead. I think that just needs to run Meeting.objects.filter(time_zone="GMT").update(time_zone="UTC").

[rjsparks]

We'll add the migration - but it won't be in this week's release.

[bkmgit]

Ok. Can do it next week, but please feel free to make the change if it needs to be sooner than that.

[jennifer-richards]

Added the migration

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.70%. Comparing base (18cea10) to head (f4146d2).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8681      +/-   ##
==========================================
- Coverage   88.71%   88.70%   -0.01%     
==========================================
  Files         320      320              
  Lines       41793    41787       -6     
==========================================
- Hits        37078    37069       -9     
- Misses       4715     4718       +3     

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[bkmgit]

@jennifer-richards thanks.

[jennifer-richards]

@bkmgit You're welcome, and thank you for the PR!