Update dependency djangorestframework to v3.15.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
djangorestframework (source, changelog)	==3.12.4 -> ==3.15.1

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Release Notes

encode/django-rest-framework (djangorestframework)

v3.15.1

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v3.15.0

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v3.14.0: Version 3.14.0

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• Django 2.2 is no longer supported. #​8662
• Django 4.1 compatibility. #​8591
• Add --api-version CLI option to generateschema management command. #​8663
• Enforce is_valid(raise_exception=False) as a keyword-only argument. #​7952
• Stop calling set_context on Validators. #​8589
• Return NotImplemented from ErrorDetails.__ne__. #​8538
• Don't evaluate DateTimeField.default_timezone when a custom timezone is set. #​8531
• Make relative URLs clickable in Browseable API. #​8464
• Support ManyRelatedField falling back to the default value when the attribute specified by dot notation doesn't exist. Matches ManyRelatedField.get_attribute to Field.get_attribute. #​7574
• Make schemas.openapi.get_reference public. #​7515
• Make ReturnDict support dict union operators on Python 3.9 and later. #​8302
• Update throttling to check if request.user is set before checking if the user is authenticated. #​8370

v3.13.1: Version 3.13.1

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• Revert schema naming changes with function based @api_view. #​8297

v3.13.0: Version 3.13.0

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• Django 4.0 compatability. #​8178
• Add max_length and min_length options to ListSerializer. #​8165
• Add get_request_serializer and get_response_serializer hooks to AutoSchema. #​7424
• Fix OpenAPI representation of null-able read only fields. #​8116
• Respect UNICODE_JSON setting in API schema outputs. #​7991
• Fix for RemoteUserAuthentication. #​7158
• Make Field constructors keyword-only. #​7632

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