Bump prometheus-client from 0.22.1 to 0.23.1 (#327)

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
...

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Author: dependabot[bot]