chore(deps): revert "bump to fixed django-celery-beat"

[jennifer-richards]

This reverts commit 5b77ba6. There are still reports of trouble with django-celery-beat 2.8.1.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.79%. Comparing base (279cbee) to head (9487fb7).
Report is 11 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8899   +/-   ##
=======================================
  Coverage   88.79%   88.79%           
=======================================
  Files         314      314           
  Lines       41402    41402           
=======================================
  Hits        36764    36764           
  Misses       4638     4638           

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