Bump tokio from 1.21.2 to 1.23.1

Bumps [tokio](https://github.com/tokio-rs/tokio) from 1.21.2 to 1.23.1.
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](tokio-rs/tokio@tokio-1.21.2...tokio-1.23.1)

---
updated-dependencies:
- dependency-name: tokio
  dependency-type: direct:production
...

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

Author: dependabot[bot]

Cargo.lock

@@ -17,7 +17,7 @@ serde_json = "1.0"
 structopt = "0.3"
 thiserror = "1.0"
 time = { version="0.3", default-features=false, features=["local-offset", "macros", "serde", "serde-human-readable", "std"] }
-tokio = { version="1.21", default-features=false, features=["macros", "rt-multi-thread", "time"] }
+tokio = { version="1.23", default-features=false, features=["macros", "rt-multi-thread", "time"] }
 tokio-stream = { version="0.1", default-features=false }
 tokio-util = { version="0.6", default-features=false, features=["time"] }