Update frequenz-client-base requirement

Updates the requirements on [frequenz-client-base](https://github.com/frequenz-floss/frequenz-client-base-python) to permit the latest version.
- [Release notes](https://github.com/frequenz-floss/frequenz-client-base-python/releases)
- [Changelog](https://github.com/frequenz-floss/frequenz-client-base-python/blob/v0.x.x/RELEASE_NOTES.md)
- [Commits](frequenz-floss/frequenz-client-base-python@v0.6.0...v0.7.0)

---
updated-dependencies:
- dependency-name: frequenz-client-base
  dependency-type: direct:production
...

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

Author: dependabot[bot]

pyproject.toml

@@ -33,7 +33,7 @@ dependencies = [
   "grpcio >= 1.54.2, < 2",
   "grpcio-tools >= 1.54.2, < 2",
   "protobuf >= 4.25.3, < 6",
-  "frequenz-client-base >= 0.6.0, < 0.7.0",
+  "frequenz-client-base >= 0.6.0, < 0.8.0",
 ]
 dynamic = ["version"]