fix(deps): bump prometheus-client from 0.19.0 to 0.20.0

Bumps [prometheus-client](https://github.com/prometheus/client_python) from 0.19.0 to 0.20.0.
- [Release notes](https://github.com/prometheus/client_python/releases)
- [Commits](prometheus/client_python@v0.19.0...v0.20.0)

---
updated-dependencies:
- dependency-name: prometheus-client
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -1,5 +1,5 @@
 requests==2.31.0
 GitPython==3.1.41
-prometheus-client==0.19.0
+prometheus-client==0.20.0
 rich==13.7.0
 schedule==1.2.1