Bump metrics-util from 0.20.1 to 0.20.3 (#476)

Bumps [metrics-util](https://github.com/metrics-rs/metrics) from 0.20.1 to 0.20.3.
- [Changelog](https://github.com/metrics-rs/metrics/blob/main/release.toml)
- [Commits](metrics-rs/metrics@metrics-util-v0.20.1...metrics-util-v0.20.3)

---
updated-dependencies:
- dependency-name: metrics-util
  dependency-version: 0.20.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Cargo.lock

@@ -79,7 +79,7 @@ criterion = { version = "0.8.2", features = ["html_reports"] }
 crossbeam-queue = "0.3"
 blake3 = "1.8"
 toml = "1.1.0"
-metrics-util = "0.20.1"
+metrics-util = "0.20.3"
 metrics-exporter-prometheus = "0.18"
 opentelemetry = "0.31.0"
 opentelemetry-otlp = { version = "0.31.1", default-features = false, features = ["http-proto", "reqwest-blocking-client", "grpc-tonic"] }