chore: upgrade Django to 3.2.21

[magajh]

See: openedx/wg-build-test-release#303

[openedx-webhooks]

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[mphilbrick211]

Hi @openedx/enterprise-titans! Would someone be able to please review/merge this for us? Thank you!

[macdiesel]

We don't accept OSPRs for library upgrades. We have a bot and team that does this work already.

[openedx-webhooks]

@magajh Even though your pull request wasn’t merged, please take a moment to answer a two question survey so we can improve your experience in the future.

[openedx-webhooks]

@magajh Even though your pull request wasn’t merged, please take a moment to answer a two question survey so we can improve your experience in the future.