Bump django from 3.1.10 to 3.1.12
Bump django from 3.1.10 to 3.1.12

Bumps [django](https://github.com/django/django) from 3.1.10 to 3.1.12.
- [Release notes](https://github.com/django/django/releases)
- [Commits](https://github.com/django/django/compare/3.1.10...3.1.12)

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

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
GoogleCloudPlatform/django-demo-app-unicodex,GoogleCloudPlatform/django-demo-app-unicodex,GoogleCloudPlatform/django-demo-app-unicodex