Bump djangorestframework from 3.10.3 to 3.11.0

Bumps [djangorestframework](https://github.com/encode/django-rest-framework) from 3.10.3 to 3.11.0.
- [Release notes](https://github.com/encode/django-rest-framework/releases)
- [Commits](encode/django-rest-framework@3.10.3...3.11.0)

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

requirements/base.txt

@@ -6,7 +6,7 @@ django-csp==3.6
 django-csp-reports==1.3
 django-crispy-forms==1.8.1
 django-filter==2.2.0
-djangorestframework==3.10.3
+djangorestframework==3.11.0
 django-secure==1.0.1
 django-toolbelt==0.0.1
 gunicorn==20.0.4