build(deps): update signal-hook requirement from 0.3.18 to 0.4.4

Updates the requirements on [signal-hook](https://github.com/vorner/signal-hook) to permit the latest version.
- [Changelog](https://github.com/vorner/signal-hook/blob/master/CHANGELOG.md)
- [Commits](vorner/signal-hook@v0.3.18...v0.4.4)

---
updated-dependencies:
- dependency-name: signal-hook
  dependency-version: 0.4.4
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

crates/shim/Cargo.toml

@@ -42,7 +42,7 @@ nix = { workspace = true, features = [
     "sched",
 ] }
 oci-spec = { workspace = true, features = ["runtime"] }
-signal-hook = "0.3.18"
+signal-hook = "0.4.4"
 serde = { workspace = true, features = ["derive", "std"] }
 serde_json = { workspace = true, features = ["std"] }
 tempfile.workspace = true