build(deps): bump tokio-util from 0.6.3 to 0.6.4

Bumps [tokio-util](https://github.com/tokio-rs/tokio) from 0.6.3 to 0.6.4.
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](tokio-rs/tokio@tokio-util-0.6.3...tokio-util-0.6.4)

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

src/dataflow/Cargo.toml

@@ -45,6 +45,6 @@ serde = { version = "1.0.124", features = ["derive"] }
 serde_json = "1.0.64"
 timely = { git = "https://github.com/TimelyDataflow/timely-dataflow", default-features = false, features = ["bincode"] }
 tokio = { version = "1.3.0", features = ["fs", "rt"] }
-tokio-util = { version = "0.6.3", features = ["codec"] }
+tokio-util = { version = "0.6.4", features = ["codec"] }
 url = { version = "2.2.1", features = ["serde"] }
 uuid = { version = "0.8.2", features = ["serde", "v4"] }

src/pgwire/Cargo.toml

@@ -29,4 +29,4 @@ sql = { path = "../sql" }
 tokio = "1.3.0"
 tokio-openssl = "0.6.1"
 tokio-stream = "0.1.3"
-tokio-util = { version = "0.6.3", features = ["codec"] }
+tokio-util = { version = "0.6.4", features = ["codec"] }