chore(deps): update prometheus-client requirement

Updates the requirements on [prometheus-client](https://github.com/prometheus/client_python) to permit the latest version.
- [Release notes](https://github.com/prometheus/client_python/releases)
- [Commits](prometheus/client_python@v0.21.1...v0.22.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pyproject.toml

@@ -8,7 +8,7 @@ readme = "README.md"
 dependencies = [
     "fastapi>=0.115.9,<0.116",
     "pandas>=2.2.3,<3",
-    "prometheus-client>=0.21.1,<0.22",
+    "prometheus-client>=0.21.1,<0.23",
     "pydantic>=2.4.2,<3",
     "uvicorn>=0.34.0,<0.35",
     "protobuf>=4.24.4,<7",