Bump djangorestframework from 3.14.0 to 3.15.2

Bumps [djangorestframework](https://github.com/encode/django-rest-framework) from 3.14.0 to 3.15.2.
- [Release notes](https://github.com/encode/django-rest-framework/releases)
- [Commits](encode/django-rest-framework@3.14.0...3.15.2)

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

Signed-off-by: dependabot[bot] <support@github.com>

setup.py

@@ -11,7 +11,7 @@
     include_package_data=True,
     install_requires=[
         "Django==4.1.13",
-        "djangorestframework==3.14.0",
+        "djangorestframework==3.15.2",
         "coreapi==2.3.3",
         "Markdown==3.1.1",
         "dj-database-url==1.2.0",