chore: upgrade Django to 3.2.21

[magajh]

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

[openedx-webhooks]

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[itsjeyd]

Hi @magajh, thank you for this contribution! It looks like the changes are ready for engineering review. @mattcarter Could someone from Aurora have a look at this PR?

[openedx-webhooks]

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