chore: bump signal-hook from 0.3.10 to 0.3.12 (#21721)

Bumps [signal-hook](https://github.com/vorner/signal-hook) from 0.3.10 to 0.3.12.
- [Release notes](https://github.com/vorner/signal-hook/releases)
- [Changelog](https://github.com/vorner/signal-hook/blob/master/CHANGELOG.md)
- [Commits](https://github.com/vorner/signal-hook/compare/v0.3.10...v0.3.12)

---
updated-dependencies:
- dependency-name: signal-hook
  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>

validator/Cargo.toml

@@ -56,7 +56,7 @@ jemallocator = {package = "tikv-jemallocator", version = "0.4.1", features = ["u
 
 [target."cfg(unix)".dependencies]
 libc = "0.2.109"
-signal-hook = "0.3.10"
+signal-hook = "0.3.12"
 sysctl = "0.4.3"
 
 [package.metadata.docs.rs]