Bump sysinfo from 0.28.1 to 0.28.2 in /cmd/zfs_object_agent (openzfs#746

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Bumps [sysinfo](https://github.com/GuillaumeGomez/sysinfo) from 0.28.1 to 0.28.2.
- [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] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

cmd/zfs_object_agent/zettacache/Cargo.toml

@@ -34,7 +34,7 @@ rand = "0.8.3"
 seahash = "4.1.0"
 serde = { version = "1.0.152", features = ["derive", "rc"] }
 serde_json = "1.0.93"
-sysinfo = "0.28.1"
+sysinfo = "0.28.2"
 tokio = { version = "1.26", features = ["full"] }
 tokio-stream = "0.1.12"
 util = { path = "../util" }