Bump djangorestframework from 3.7.4 to 3.9.2

[dependabot-preview]

Bumps djangorestframework from 3.7.4 to 3.9.2.

Release notes

Sourced from djangorestframework's releases.

Version 3.9.2

See Release Notes for details.

Version 3.9.1

Change Notes:
https://www.django-rest-framework.org/community/release-notes/#39x-series

Verision 3.9.0

Release announcement:
https://www.django-rest-framework.org/community/3.9-announcement/

Change Notes:
https://www.django-rest-framework.org/community/release-notes/#39x-series

Version 3.8.2

Point release for 3.8.x series

• Fix read_only + default unique_together validation. #5922
• authtoken.views import coreapi from rest_framework.compat, not directly. #5921
• Docs: Add missing argument 'detail' to Route #5920

Version 3.8.1

• Use old url_name behavior in route decorators #5915

  For list_route and detail_route maintain the old behavior of url_name,
  basing it on the url_path instead of the function name.

Version 3.8

• Release Announcement

• 3.8.0 Milestone

• Breaking Change: Alter read_only plus default behaviour. #5886

  read_only fields will now always be excluded from writable fields.

  Previously read_only fields with a default value would use the default for create and update operations.

  In order to maintain the old behaviour you may need to pass the value of read_only fields when calling save() in
  the view:

    def perform_create(self, serializer):
        serializer.save(owner=self.request.user)
  

  Alternatively you may override save() or create() or update() on the serialiser as appropriate.

• Correct allow_null behaviour when required=False #5888

  Without an explicit default, allow_null implies a default of null for outgoing serialisation. Previously such
  fields were being skipped when read-only or otherwise not required.

... (truncated)

Commits

• 0ab527a Updated release notes for v3.9.2
• ac4c789 Update version for v3.9.2 release.
• 7eac866 Remove executable bit from static assets (#6484)
• 94593b3 Introduce RemovedInDRF…Warning classes to simplify deprecations. (#6480)
• a216d02 Merge multiple isinstance() calls to one (#6481)
• 31bf597 Updated note on BooleanField required kwarg generation.
• 1dc81ac Fixed a typo in pagination docs. (#6475)
• 317174b Avoided calling distinct on annotated fields in SearchFilter. (#6240)
• 2daf6f1 Add negation ~ operator to permissions composition (#6361)
• 739b0a2 Fix DeprecationWarning in tests when accessing collections.abc classes via co...
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #1714.