Bump prometheus-client from 0.17.1 to 0.20.0

Bumps [prometheus-client](https://github.com/prometheus/client_python) from 0.17.1 to 0.20.0.
- [Release notes](https://github.com/prometheus/client_python/releases)
- [Commits](prometheus/client_python@v0.17.1...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

@@ -36,7 +36,7 @@ requests[security] >= 2.25.1, < 3.0.0
 tabulate==0.9.0
 zipstream-new==1.1.8
 sentry-sdk[flask]==1.31.0
-prometheus-client==0.17.1
+prometheus-client==0.20.0
 
 # Testing dependencies
 factory-boy >=3.2.0, < 4.0.0