build(deps): bump tokio-util from 0.6.8 to 0.6.9 (#1342)

Bumps [tokio-util](https://github.com/tokio-rs/tokio) from 0.6.8 to 0.6.9.
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](tokio-rs/tokio@tokio-util-0.6.8...tokio-util-0.6.9)

---
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>
(cherry picked from commit 271f79f)
Signed-off-by: Oliver Gould <ver@buoyant.io>

Cargo.lock

@@ -2191,9 +2191,9 @@ dependencies = [
 
 [[package]]
 name = "tokio-util"
-version = "0.6.8"
+version = "0.6.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "08d3725d3efa29485e87311c5b699de63cde14b00ed4d256b8318aa30ca452cd"
+checksum = "9e99e1983e5d376cd8eb4b66604d2e99e79f5bd988c3055891dcd8c9e2604cc0"
 dependencies = [
  "bytes",
  "futures-core",

linkerd/proxy/discover/Cargo.toml

@@ -16,7 +16,7 @@ linkerd-error = { path = "../../error" }
 linkerd-proxy-core = { path = "../core" }
 linkerd-stack = { path = "../../stack" }
 tokio = { version = "1", features = ["rt", "sync", "time"] }
-tokio-util = "0.6.8"
+tokio-util = "0.6.9"
 tower = { version = "0.4.10", features = ["discover"] }
 tracing = "0.1.29"
 pin-project = "1"