Bump tokio-util from 0.6.9 to 0.7.1

Bumps [tokio-util](https://github.com/tokio-rs/tokio) from 0.6.9 to 0.7.1.
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](tokio-rs/tokio@tokio-util-0.6.9...tokio-util-0.7.1)

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

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

Author: dependabot[bot]

Cargo.lock

@@ -31,7 +31,7 @@ tracing-subscriber = { version = "0.3", features = ["fmt", "json"] }
 tracing-appender = "0.2"
 tokio = { version = "^1.4", features = ["rt-multi-thread", "time", "sync", "rt", "signal", "test-util"] }
 tokio-stream = { version = "0.1.4", features = ["sync"] }
-tokio-util = { version = "0.6.0", features = ["time"] }
+tokio-util = { version = "0.7.1", features = ["time"] }
 tonic = "0.4"
 multiaddr = { package = "parity-multiaddr", version = "0.11" }
 rand = "0.8.5"

explorer/Cargo.toml

@@ -53,7 +53,7 @@ tracing-subscriber = { version = "0.3", features = ["fmt", "json", "time"] }
 tracing-appender = "0.2"
 tokio = { version = "^1.15", features = ["rt-multi-thread", "time", "sync", "rt", "signal", "test-util"] }
 tokio-stream = { version = "0.1.4", features = ["sync"] }
-tokio-util = { version = "0.6.0", features = ["time"] }
+tokio-util = { version = "0.7.1", features = ["time"] }
 tonic = "0.6"
 lru = "0.7"
 warp = { version = "0.3.2", features = ["tls"] }