build(deps): update crossterm requirement from 0.27 to 0.28

Updates the requirements on [crossterm](https://github.com/crossterm-rs/crossterm) to permit the latest version.
- [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
...

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

Cargo.toml

@@ -69,6 +69,6 @@ rstest = "0.19"
 # We don't need any of the default features for crossterm.
 # However, the windows build needs the windows feature enabled.
 [target.'cfg(not(windows))'.dependencies]
-crossterm = { version = "0.27", optional=true, default-features = false }
+crossterm = { version = "0.28", optional=true, default-features = false }
 [target.'cfg(windows)'.dependencies]
 crossterm = { version = "0.27", optional=true, default-features = false, features=["windows"] }