Bump djangorestframework from 3.3.0 to 3.9.1

[dependabot[bot]]

Bumps djangorestframework from 3.3.0 to 3.9.1.

Release notes

Sourced from djangorestframework's releases.

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.

  Possible backwards compatibility break if you were relying on such fields being excluded from the outgoing representation. In order to restore the old behaviour you can override data to exclude the field when None.

... (truncated)

Commits

• 453196e Version 3.9.1 (#6405)
• 4bb9a3c Fix XSS caused by disabled autoescaping in the default DRF Browsable API view...
• e3bd4b9 Fix #1811: take limit_choices_to into account with FK (#6371)
• 9c408b2 Remove reference to deprecated drf-openapi package (#6398)
• e0ae975 Fix a badly formatted title in docs (#6089)
• c052a86 compat: (py2) urlparse = urllib.parse (py3) (#6262)
• a49d744 Fix OpenAPI links (#6382)
• 0860ef9 Update quickstart to Django 2.0 routing syntax (#6385)
• 587058e Allow run_validators() to handle non-dict types. (#6365)
• 0cf18c4 Use Default Version in URLPathVersioning if 'version' Didn't Specified by Cli...
• Additional commits viewable in compare view

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