build(deps): bump github.com/elastic/elastic-agent-system-metrics from 0.9.2 to 0.9.3 (#3489)

* build(deps): bump github.com/elastic/elastic-agent-system-metrics

Bumps [github.com/elastic/elastic-agent-system-metrics](https://github.com/elastic/elastic-agent-system-metrics) from 0.9.2 to 0.9.3.
- [Release notes](https://github.com/elastic/elastic-agent-system-metrics/releases)
- [Changelog](https://github.com/elastic/elastic-agent-system-metrics/blob/main/CHANGELOG.md)
- [Commits](elastic/elastic-agent-system-metrics@v0.9.2...v0.9.3)

---
updated-dependencies:
- dependency-name: github.com/elastic/elastic-agent-system-metrics
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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