Bump djangorestframework from 3.8 to 3.11.2

Bumps [djangorestframework](https://github.com/encode/django-rest-framework) from 3.8 to 3.11.2.
- [Release notes](https://github.com/encode/django-rest-framework/releases)
- [Commits](https://github.com/encode/django-rest-framework/compare/3.8.0...3.11.2

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

requirements.txt

@@ -9,7 +9,7 @@ urllib3==1.25.10
 certifi
 whitenoise==2.0.3
 pillow==8.1.0
-djangorestframework==3.8
+djangorestframework==3.11.2
 markdown==2.6.2
 django-filter==0.11.0
 requests==2.25.1