deps: bump tokio-util from 0.7.14 to 0.7.15

Bumps [tokio-util](https://github.com/tokio-rs/tokio) from 0.7.14 to 0.7.15.
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](tokio-rs/tokio@tokio-util-0.7.14...tokio-util-0.7.15)

---
updated-dependencies:
- dependency-name: tokio-util
  dependency-version: 0.7.15
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Cargo.lock

@@ -97,7 +97,7 @@ tracing-futures = { features = ["futures-03"], version = "0.2.5" }
 
 tokio = { default-features = false, version = "1.44.2" }
 tokio-stream = { default-features = false, version = "0.1.17" }
-tokio-util = { default-features = false, version = "0.7.14" }
+tokio-util = { default-features = false, version = "0.7.15" }
 unsigned-varint = { version = "0.8.0", features = ["asynchronous_codec"] }
 wasm-bindgen-futures = { version = "0.4.50" }
 web-time = "1.1.0"