Bump django in /generators/app/templates/django/mysite

Bumps [django](https://github.com/django/django) from 3.0.3 to 3.1.14.
- [Release notes](https://github.com/django/django/releases)
- [Commits](django/django@3.0.3...3.1.14)

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

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

generators/app/templates/django/mysite/Pipfile

@@ -4,7 +4,7 @@ verify_ssl = true
 name = "pypi"
 
 [packages]
-Django = "==3.0.3"
+Django = "==3.1.14"
 Pillow = "*"
 celery = "*"
 djangorestframework = "*"