Bump sysinfo from 0.21.1 to 0.21.2 in /src/agent (microsoft#1513)

Bumps [sysinfo](https://github.com/GuillaumeGomez/sysinfo) from 0.21.1 to 0.21.2.
- [Release notes](https://github.com/GuillaumeGomez/sysinfo/releases)
- [Changelog](https://github.com/GuillaumeGomez/sysinfo/blob/master/CHANGELOG.md)
- [Commits](https://github.com/GuillaumeGomez/sysinfo/commits)

---
updated-dependencies:
- dependency-name: sysinfo
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: Marc Greisen <marc@greisen.org>