build(deps): bump django-upgrade from 1.27.0 to 1.28.0

Bumps [django-upgrade](https://github.com/adamchainz/django-upgrade) from 1.27.0 to 1.28.0.
- [Changelog](https://github.com/adamchainz/django-upgrade/blob/main/docs/changelog.rst)
- [Commits](adamchainz/django-upgrade@1.27.0...1.28.0)

---
updated-dependencies:
- dependency-name: django-upgrade
  dependency-version: 1.28.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]