Update frequenz-sdk requirement

Updates the requirements on [frequenz-sdk](https://github.com/frequenz-floss/frequenz-sdk-python) to permit the latest version.
- [Release notes](https://github.com/frequenz-floss/frequenz-sdk-python/releases)
- [Changelog](https://github.com/frequenz-floss/frequenz-sdk-python/blob/v1.x.x/RELEASE_NOTES.md)
- [Commits](frequenz-floss/frequenz-sdk-python@v1.0.0-rc1300...v1.0.0-rc1400)

---
updated-dependencies:
- dependency-name: frequenz-sdk
  dependency-type: direct:production
...

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

Author: dependabot[bot]

pyproject.toml

@@ -39,7 +39,7 @@ dependencies = [
   # Make sure to update the version for cross-referencing also in the
   # mkdocs.yml file when changing the version here (look for the config key
   # plugins.mkdocstrings.handlers.python.import)
-  "frequenz-sdk >= 1.0.0-rc1300, < 1.0.0-rc1400",
+  "frequenz-sdk >= 1.0.0-rc1300, < 2.0.0",
   "frequenz-channels >= 1.3.0, < 2.0.0",
   "frequenz-client-dispatch >= 0.8.1, < 0.9.0",
 ]