[Security] Bump djangorestframework from 3.10.3 to 3.11.2

Bumps [djangorestframework](https://github.com/encode/django-rest-framework) from 3.10.3 to 3.11.2. **This update includes a security fix.**
- [Release notes](https://github.com/encode/django-rest-framework/releases)
- [Commits](encode/django-rest-framework@3.10.3...3.11.2)

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

requirements.txt

@@ -13,7 +13,7 @@ django-queryset-csv==1.0.2
 psycopg2-binary==2.8.6
 django-webpack-loader==0.5.0
 django-filter==1.1.0
-djangorestframework==3.10.3
+djangorestframework==3.11.2
 djangorestframework-filters==0.11.1
 djangorestframework-queryfields==1.0.0
 django-vote==2.1.7