Update frequenz-client-microgrid requirement

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

---
updated-dependencies:
- dependency-name: frequenz-client-microgrid
  dependency-version: 0.7.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

pyproject.toml

@@ -29,7 +29,7 @@ dependencies = [
   # Make sure to update the mkdocs.yml file when
   # changing the version
   # (plugins.mkdocstrings.handlers.python.import)
-  "frequenz-client-microgrid >= 0.6.0, < 0.7.0",
+  "frequenz-client-microgrid >= 0.6.0, < 0.8.0",
   "frequenz-channels >= 1.6.0, < 2.0.0",
   "frequenz-quantities[marshmallow] >= 1.0.0, < 2.0.0",
   "networkx >= 2.8, < 4",