chore: bump sysctl from 0.4.2 to 0.4.3 (#21117)

Bumps [sysctl](https://github.com/johalun/sysctl-rs) from 0.4.2 to 0.4.3.
- [Release notes](https://github.com/johalun/sysctl-rs/releases)
- [Changelog](https://github.com/johalun/sysctl-rs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/johalun/sysctl-rs/commits)

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

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validator/Cargo.toml

@@ -57,7 +57,7 @@ jemallocator = {package = "tikv-jemallocator", version = "0.4.1", features = ["u
 [target."cfg(unix)".dependencies]
 libc = "0.2.106"
 signal-hook = "0.3.10"
-sysctl = "0.4.2"
+sysctl = "0.4.3"
 
 [package.metadata.docs.rs]
 targets = ["x86_64-unknown-linux-gnu"]