Bump django from 3.0.4 to 3.1.14

Bumps [django](https://github.com/django/django) from 3.0.4 to 3.1.14.
- [Release notes](https://github.com/django/django/releases)
- [Commits](django/django@3.0.4...3.1.14)

---
updated-dependencies:
- dependency-name: django
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -3,7 +3,7 @@ certifi==2019.11.28
 chardet==3.0.4
 coreapi==2.3.3
 coreschema==0.0.4
-Django==3.0.4
+Django==3.1.14
 django-cors-headers==3.2.1
 django-filter==2.2.0
 django-templated-mail==1.1.1