Bump django from 4.2.6 to 4.2.7 in /grai-server/app

Bumps [django](https://github.com/django/django) from 4.2.6 to 4.2.7.
- [Commits](django/django@4.2.6...4.2.7)

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

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