Bump prometheus-client from 0.21.0 to 0.21.1

Bumps [prometheus-client](https://github.com/prometheus/client_python) from 0.21.0 to 0.21.1.
- [Release notes](https://github.com/prometheus/client_python/releases)
- [Commits](prometheus/client_python@v0.21.0...v0.21.1)

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

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

Author: dependabot[bot]

poetry.lock

@@ -11,7 +11,7 @@ start = "gh_actions_exporter.main:start"
 [tool.poetry.dependencies]
 python = "^3.9"
 fastapi = "^0.115.5"
-prometheus-client = "^0.21.0"
+prometheus-client = "^0.21.1"
 uvicorn = { extras = ["standard"], version = "^0.34.0" }
 python-multipart = "^0.0.19"
 PyYAML = "^6.0"