Update ctrlc2 requirement from 3.7.3 to 4.0.0

Updates the requirements on [ctrlc2](https://github.com/ssrlive/ctrlc2) to permit the latest version.
- [Commits](https://github.com/ssrlive/ctrlc2/commits)

---
updated-dependencies:
- dependency-name: ctrlc2
  dependency-version: 4.0.0
  dependency-type: direct:production
...

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

Cargo.toml

@@ -31,7 +31,7 @@ async-trait = "0.1.89"
 base64easy = "0.1.7"
 chrono = "0.4.44"
 clap = { version = "4.6.1", features = ["derive", "wrap_help", "color"] }
-ctrlc2 = { version = "3.7.3", features = ["async", "termination"] }
+ctrlc2 = { version = "4.0.0", features = ["async", "termination"] }
 digest_auth = "0.3.1"
 dotenvy = "0.15.7"
 env_logger = "0.11.10"