Bump tui from 0.18.0 to 0.19.0 in /src/agent

Bumps [tui](https://github.com/fdehau/tui-rs) from 0.18.0 to 0.19.0.
- [Release notes](https://github.com/fdehau/tui-rs/releases)
- [Changelog](https://github.com/fdehau/tui-rs/blob/master/CHANGELOG.md)
- [Commits](fdehau/tui-rs@v0.18.0...v0.19.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

src/agent/Cargo.lock

@@ -43,7 +43,7 @@ thiserror = "1.0"
 tokio = { version = "1.16", features = ["full"] }
 tokio-util = { version = "0.7", features = ["full"] }
 tokio-stream = "0.1"
-tui = { version = "0.18", default-features = false, features = ['crossterm'] }
+tui = { version = "0.19", default-features = false, features = ['crossterm'] }
 url = { version = "2.2", features = ["serde"] }
 uuid = { version = "0.8", features = ["serde", "v4"] }
 chrono = "0.4"