Update frequenz-client-dispatch requirement

Updates the requirements on [frequenz-client-dispatch](https://github.com/frequenz-floss/frequenz-client-dispatch-python) to permit the latest version.
- [Release notes](https://github.com/frequenz-floss/frequenz-client-dispatch-python/releases)
- [Changelog](https://github.com/frequenz-floss/frequenz-client-dispatch-python/blob/v0.x.x/RELEASE_NOTES.md)
- [Commits](frequenz-floss/frequenz-client-dispatch-python@v0.8.4...v0.9.0)

---
updated-dependencies:
- dependency-name: frequenz-client-dispatch
  dependency-version: 0.9.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

pyproject.toml

@@ -40,7 +40,7 @@ dependencies = [
   # plugins.mkdocstrings.handlers.python.import)
   "frequenz-sdk >= 1.0.0-rc1302, < 1.0.0-rc1900",
   "frequenz-channels >= 1.6.1, < 2.0.0",
-  "frequenz-client-dispatch >= 0.8.4, < 0.9.0",
+  "frequenz-client-dispatch >= 0.8.4, < 0.10.0",
 ]
 dynamic = ["version"]