Bump djangorestframework from 3.10.3 to 3.11.2 (#371)

Bumps [djangorestframework](https://github.com/encode/django-rest-framework) from 3.10.3 to 3.11.2.
- [Release notes](https://github.com/encode/django-rest-framework/releases)
- [Commits](https://github.com/encode/django-rest-framework/compare/3.10.3...3.11.2)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: James Ramm <JamesRamm@users.noreply.github.com>

setup.py

@@ -91,7 +91,7 @@ setup(
         'wagtail==2.11.8',
         'django-countries==5.5',
         'django-extensions==2.2.1',
-        'djangorestframework==3.10.3',
+        'djangorestframework==3.11.2',
         'django-ipware==2.1.0',
         'django-polymorphic==2.0.3',
     ],