Bump metrics-exporter-prometheus from 0.18.1 to 0.18.3 (#139)

Bumps [metrics-exporter-prometheus](https://github.com/metrics-rs/metrics) from 0.18.1 to 0.18.3.
- [Changelog](https://github.com/metrics-rs/metrics/blob/main/release.toml)
- [Commits](metrics-rs/metrics@metrics-exporter-prometheus-v0.18.1...metrics-exporter-prometheus-v0.18.3)

---
updated-dependencies:
- dependency-name: metrics-exporter-prometheus
  dependency-version: 0.18.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]