deps: bump tokio-util from 0.7.11 to 0.7.12 (#598)

Bumps [tokio-util](https://github.com/tokio-rs/tokio) from 0.7.11 to 0.7.12.
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](tokio-rs/tokio@tokio-util-0.7.11...tokio-util-0.7.12)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

ext/libp2p/Cargo.toml

@@ -17,7 +17,7 @@ deno_core.workspace = true
 log.workspace = true
 smallvec = "1.13.2"
 tokio = { workspace = true, features = ["rt", "macros", "sync", "time"] }
-tokio-util = "0.7.11"
+tokio-util = "0.7.12"
 either = "1.13.0"
 
 [dependencies.libp2p]