Update ratatui requirement from 0.26.3 to 0.28.1

Updates the requirements on [ratatui](https://github.com/ratatui/ratatui) to permit the latest version.
- [Release notes](https://github.com/ratatui/ratatui/releases)
- [Changelog](https://github.com/ratatui/ratatui/blob/main/CHANGELOG.md)
- [Commits](ratatui/ratatui@v0.26.3...v0.28.1)

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

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

tombstone/Cargo.toml

@@ -5,7 +5,7 @@ edition = "2021"
 
 [dependencies]
 crossterm = "0.27.0"
-ratatui = { version = "0.26.3", features = ["all-widgets"] }
+ratatui = { version = "0.28.1", features = ["all-widgets"] }
 spirit = { path = "../spirit" }
 tracing = "0.1.40"
 tracing-subscriber = "0.3.18"