Bump prometheus-client from 0.22.1 to 0.23.1 (#48)

Bumps [prometheus-client](https://github.com/prometheus/client_python) from 0.22.1 to 0.23.1.
- [Release notes](https://github.com/prometheus/client_python/releases)
- [Commits](prometheus/client_python@v0.22.1...v0.23.1)

---
updated-dependencies:
- dependency-name: prometheus-client
  dependency-version: 0.23.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
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==2.32.4
-prometheus_client==0.22.1
+prometheus_client==0.23.1
 crontab==1.0.4
 retry==0.9.2
 kubernetes==34.1.0