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
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Marc Greisen <[email protected]>

Author: dependabot[bot]