Bump crossterm from 0.22.1 to 0.23.1 in /src/agent

Bumps [crossterm](https://github.com/crossterm-rs/crossterm) from 0.22.1 to 0.23.1.
- [Release notes](https://github.com/crossterm-rs/crossterm/releases)
- [Changelog](https://github.com/crossterm-rs/crossterm/blob/master/CHANGELOG.md)
- [Commits](https://github.com/crossterm-rs/crossterm/commits)

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

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

Author: dependabot[bot]

src/agent/Cargo.lock

@@ -17,7 +17,7 @@ atexit = { path = "../atexit" }
 backoff = { version = "0.4", features = ["tokio"] }
 clap = "2.34"
 coverage = { path = "../coverage" }
-crossterm = "0.22"
+crossterm = "0.23"
 env_logger = "0.9"
 flume = "0.10"
 futures = "0.3"