chore(deps): update signal-hook requirement from 0.3 to 0.4

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@v0.3.0...v0.4.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

testcontainers/Cargo.toml

@@ -40,7 +40,7 @@ serde = { version = "1", features = ["derive"] }
 serde-java-properties = { version = "0.2.0", optional = true }
 serde_json = "1"
 serde_with = "3.7.0"
-signal-hook = { version = "0.3", optional = true }
+signal-hook = { version = "0.4", optional = true }
 thiserror = "2.0.3"
 tokio = { version = "1", features = ["macros", "fs", "rt-multi-thread", "process"] }
 tokio-stream = "0.1.15"