fix(deps): bump tokio-util from 0.7.16 to 0.7.18

Bumps [tokio-util](https://github.com/tokio-rs/tokio) from 0.7.16 to 0.7.18.
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](tokio-rs/tokio@tokio-util-0.7.16...tokio-util-0.7.18)

---
updated-dependencies:
- dependency-name: tokio-util
  dependency-version: 0.7.18
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Cargo.lock

@@ -115,7 +115,7 @@ time = { version = "0.3.39", features = ["parsing", "formatting", "local-offset"
 tokio = { version = "1.45.0", features = ["full"] }
 tokio-stream = { version = "0.1.17", features = ["io-util"] }
 tokio-tungstenite = "0.26.2"
-tokio-util = { version = "0.7.15", features = ["codec", "compat"] }
+tokio-util = { version = "0.7.18", features = ["codec", "compat"] }
 toml = "0.8.12"
 tracing = { version = "0.1.40", features = ["log"] }
 tracing-appender = "0.2.2"