chore(deps): bump tokio-test from 0.2.1 to 0.4.0

Bumps [tokio-test](https://github.com/tokio-rs/tokio) from 0.2.1 to 0.4.0.
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](https://github.com/tokio-rs/tokio/commits)

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

Author: dependabot[bot]

Cargo.lock

@@ -244,7 +244,7 @@ matches = "0.1.8"
 pretty_assertions = "0.6.1"
 tokio01-test = "0.1.1"
 tower-test = "0.3.0"
-tokio-test = "0.2"
+tokio-test = "0.4"
 tokio = { version = "0.2", features = ["test-util"] }
 assert_cmd = "1.0.2"
 reqwest = { version = "0.10.9", features = ["json"] }