Bump djangorestframework from 3.10.3 to 3.15.2 (#15)

Bumps [djangorestframework](https://github.com/encode/django-rest-framework) from 3.10.3 to 3.15.2.
- [Release notes](https://github.com/encode/django-rest-framework/releases)
- [Commits](encode/django-rest-framework@3.10.3...3.15.2)

---
updated-dependencies:
- dependency-name: djangorestframework
  dependency-type: direct:production
...

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Author: dependabot[bot]

requirements.txt

@@ -1,4 +1,4 @@
 Django==3.2.25
-djangorestframework==3.10.3
+djangorestframework==3.15.2
 pytz==2019.2
 sqlparse==0.4.4