Bump prometheus-client from 0.21.1 to 0.22.0 (#35)

Bumps [prometheus-client](https://github.com/prometheus/client_python) from 0.21.1 to 0.22.0.
- [Release notes](https://github.com/prometheus/client_python/releases)
- [Commits](prometheus/client_python@v0.21.1...v0.22.0)

---
updated-dependencies:
- dependency-name: prometheus-client
  dependency-version: 0.22.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

mercedes-me-exporter/requirements.txt

@@ -1,5 +1,5 @@
 requests==2.32.3
-prometheus_client==0.21.1
+prometheus_client==0.22.0
 crontab==1.0.4
 retry==0.9.2
 kubernetes==32.0.1