chore(deps): bump tokio from 1.20.1 to 1.21.0 (#674)

Bumps [tokio](https://github.com/tokio-rs/tokio) from 1.20.1 to 1.21.0.
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](tokio-rs/tokio@tokio-1.20.1...tokio-1.21.0)

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

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

Cargo.toml

@@ -41,7 +41,7 @@ serde_bytes = { version = "0.11", default-features = false }
 serde_json = { version = "1.0", default-features = false, features = [ "std" ] }
 thiserror = { version = "1.0", default-features = false }
 time = { version = "0.3", default-features = false, features = [ "std" ] }
-tokio = { version = "1.19", default-features = false, features = [ "macros", "rt-multi-thread", "signal" ] }
+tokio = { version = "1.21", default-features = false, features = [ "macros", "rt-multi-thread", "signal" ] }
 tokio-stream = { version = "0.1", default-features = false }
 toml = { version = "0.5", default-features = false }
 tracing = { version = "0.1", default-features = false, features = [ "std", "attributes" ] }