Bump django from 2.2.25 to 2.2.28 (#35)

Bumps [django](https://github.com/django/django) from 2.2.25 to 2.2.28.
- [Release notes](https://github.com/django/django/releases)
- [Commits](django/django@2.2.25...2.2.28)

---
updated-dependencies:
- dependency-name: django
  dependency-type: indirect
...

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Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]