chore: upgrade Django to 3.2.20

[magajh]

See: openedx/wg-build-test-release#298

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (open-release/palm.master@26c574b). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

@@                     Coverage Diff                     @@
##             open-release/palm.master     #647   +/-   ##
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  Coverage                            ?   97.52%           
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  Files                               ?       54           
  Lines                               ?     3026           
  Branches                            ?      266           
===========================================================
  Hits                                ?     2951           
  Misses                              ?       63           
  Partials                            ?       12           

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[mphilbrick211]

Hi @openedx/masters-devs-cosmonauts! Would someone be able to review/merge this for us? Thanks!

[openedx-webhooks]

@magajh 🎉 Your pull request was merged! Please take a moment to answer a two question survey so we can improve your experience in the future.