chore(deps): bump tokio-metrics from 0.4.7 to 0.4.9

Bumps [tokio-metrics](https://github.com/tokio-rs/tokio-metrics) from 0.4.7 to 0.4.9.
- [Release notes](https://github.com/tokio-rs/tokio-metrics/releases)
- [Changelog](https://github.com/tokio-rs/tokio-metrics/blob/main/CHANGELOG.md)
- [Commits](tokio-rs/tokio-metrics@v0.4.7...v0.4.9)

---
updated-dependencies:
- dependency-name: tokio-metrics
  dependency-version: 0.4.9
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]