Bump signal-hook from 0.3.18 to 0.4.1

Bumps [signal-hook](https://github.com/vorner/signal-hook) from 0.3.18 to 0.4.1.
- [Changelog](https://github.com/vorner/signal-hook/blob/master/CHANGELOG.md)
- [Commits](vorner/signal-hook@v0.3.18...v0.4.1)

---
updated-dependencies:
- dependency-name: signal-hook
  dependency-version: 0.4.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Cargo.lock

@@ -43,7 +43,7 @@
   ] }
   hex = "0.4"
   getrandom = "0.3"
-  signal-hook = "0.3"
+  signal-hook = "0.4"
   signal-hook-tokio = { version = "0.3", features = ["futures-v0_3"] }
   futures = "0.3"
   zmq = "0.10"