Bump prometheus-client from 0.14.1 to 0.22.1

Bumps [prometheus-client](https://github.com/prometheus/client_python) from 0.14.1 to 0.22.1.
- [Release notes](https://github.com/prometheus/client_python/releases)
- [Commits](prometheus/client_python@v0.14.1...v0.22.1)

---
updated-dependencies:
- dependency-name: prometheus-client
  dependency-version: 0.22.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements.txt

@@ -1,5 +1,5 @@
 aiohttp==3.8.1
-prometheus-client==0.14.1
+prometheus-client==0.22.1
 black==22.3.0
 isort==5.10.1
 cchardet==2.1.7