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] <[email protected]>

Author: dependabot[bot]

poetry.lock

@@ -28,7 +28,7 @@ google-api-python-client = "2.96.0"
 oauth2client = "4.1.3"
 libthumbor = "2.0.2"
 django-health-check = "3.17.0"
-djangorestframework = "3.14.0"
+djangorestframework = "3.15.2"
 drf-jwt = "1.19.2"
 djangorestframework-camel-case = "1.4.2"
 django-extensions = "3.2.3"