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>

pyproject.toml

@@ -23,7 +23,7 @@ Django = "^4.1"
 django-anymail = "^8.2"
 django-countries = "^7.1"
 django-prometheus = "^2.1.0"
-django-simpleui = "^2023.3"
+django-simpleui = "^2023.8"
 Markdown = "^3.3.4"
 python-alipay-sdk = "^3.0.1"
 sentry-sdk = "^1.10.1"