Bump djangorestframework from 3.11.0 to 3.11.1

Bumps [djangorestframework](https://github.com/encode/django-rest-framework) from 3.11.0 to 3.11.1.
- [Release notes](https://github.com/encode/django-rest-framework/releases)
- [Commits](encode/django-rest-framework@3.11.0...3.11.1)

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

requirements/base.txt

@@ -6,7 +6,7 @@ django-csp==3.6
 django-csp-reports==1.4
 django-crispy-forms==1.9.2
 django-filter==2.3.0
-djangorestframework==3.11.0
+djangorestframework==3.11.1
 django-toolbelt==0.0.1
 gunicorn==20.0.4
 gviz_api==1.9.0