build(deps): Bump prometheus-client from 0.21.2 to 0.22.0

Bumps [prometheus-client](https://github.com/prometheus/client_rust) from 0.21.2 to 0.22.0.
- [Release notes](https://github.com/prometheus/client_rust/releases)
- [Changelog](https://github.com/prometheus/client_rust/blob/master/CHANGELOG.md)
- [Commits](prometheus/client_rust@v0.21.2...v0.22.0)

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

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

Cargo.toml

@@ -14,7 +14,7 @@ env_logger = "0.10.0"
 futures = "0.3.28"
 libp2p = { git = "https://github.com/libp2p/rust-libp2p.git", branch = "master", version = "0.52", default-features = false, features = ["dns", "async-std", "noise", "tcp", "yamux", "identify", "kad", "ping", "metrics", "rsa", "macros", "quic"] }
 log = "0.4.20"
-prometheus-client = "0.21.2"
+prometheus-client = "0.22.0"
 parking_lot = "0.12"
 regex = "1"
 void = "1.0.2"