Update ratatui version

[purephantom]

updated ratatui version to 0.22 and fixed clippy warnings

[gin66]

Thanks for the PR. There seems to be an issue identified by github actions:

error[E0432]: unresolved import `ratatui::backend::CrosstermBackend`
  --> examples/demo.rs:20:5
   |
20 | use ratatui::backend::CrosstermBackend as SelectedBackend;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ no `CrosstermBackend` in `backend`

[purephantom]

fixed and ready for review

[slyshykO]

@gin66 , can you release a new version of the crate?