chore(deps): bump metrics-util from 0.20.3 to 0.20.4 (#1457)

Bumps [metrics-util](https://github.com/metrics-rs/metrics) from 0.20.3 to 0.20.4.
- [Changelog](https://github.com/metrics-rs/metrics/blob/main/release.toml)
- [Commits](metrics-rs/metrics@metrics-util-v0.20.3...metrics-util-v0.20.4)

---
updated-dependencies:
- dependency-name: metrics-util
  dependency-version: 0.20.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Cargo.lock

@@ -103,7 +103,7 @@ opentelemetry_sdk = { version = "0.31.0", features = ["rt-tokio"] }
 tokio = { version = "1.52.3", features = ["full"] }
 criterion = "0.8.2"
 tracing-chrome = "0.7.2"
-metrics-util = "0.20.3"
+metrics-util = "0.20.4"
 metrics-exporter-prometheus = { version = "0.18.3", default-features = false }
 serde_json = "1.0"
 hyperlight-component-macro = { workspace = true }