build(deps): bump django-simpleui from 2023.3.1 to 2023.8.28

Bumps [django-simpleui](https://github.com/newpanjing/simpleui) from 2023.3.1 to 2023.8.28.
- [Release notes](https://github.com/newpanjing/simpleui/releases)
- [Commits](https://github.com/newpanjing/simpleui/commits)

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

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