chore(deps): bump django from 3.0.7 to 3.1.13

Bumps [django](https://github.com/django/django) from 3.0.7 to 3.1.13.
- [Release notes](https://github.com/django/django/releases)
- [Commits](django/django@3.0.7...3.1.13)

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

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

requirements.txt

@@ -5,7 +5,7 @@ cffi==1.14.1
 chardet==3.0.4
 cryptography==3.0
 distro==1.5.0
-Django==3.0.7
+Django==3.1.13
 django-cors-headers==3.3.0
 django-sendgrid-v5==0.8.1
 djangorestframework==3.11.0