[chore(cargo)](deps): Bump metrics-util from 0.15.0 to 0.16.3

Bumps [metrics-util](https://github.com/metrics-rs/metrics) from 0.15.0 to 0.16.3.
- [Changelog](https://github.com/metrics-rs/metrics/blob/main/release.toml)
- [Commits](metrics-rs/metrics@metrics-util-v0.15.0...metrics-util-v0.16.3)

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

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

homestar-runtime/Cargo.toml

@@ -123,7 +123,7 @@ metrics = { version = "0.21", default-features = false }
 metrics-exporter-prometheus = { version = "0.12.1", default-features = false, features = [
  "http-listener",
 ] }
-metrics-util = "0.15"
+metrics-util = "0.16"
 miette = { version = "5.10", default-features = false, features = ["fancy"] }
 moka = { version = "0.12.4", default-features = false, features = [
  "future",