chore: make compilable with ratatui 0.29

[p0kR]

To make the crates compatible with Ratatui 0.28 and 0.29, I changed to ">=0.28". Feel free to change this, if you don't like it.

Additionally, two example were invalid and failed when calling cargo test --all. I fixed those.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (7be6cd3) to head (241cf18).

Additional details and impacted files

@@          Coverage Diff          @@
##            main     #43   +/-   ##
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  Coverage   0.00%   0.00%           
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  Files          2       2           
  Lines        150     150           
=====================================
  Misses       150     150           

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[joshka]

To make the crates compatible with Ratatui 0.28 and 0.29, I changed to ">=0.28". Feel free to change this, if you don't like it.

Unfortunately due to the way that cargo evaluates versions, this really means compile with 0.29, which causes failures for apps which have not yet bumped to 0.29 themselves. The right way for now is to bump all the versions when releasing like my changes in this have done. We're going to fix the need for this in the next Ratatui release by moving widgets into a ratatui-widgets crate, and the core things into a slower changing ratatui-core crate. This should cause no problems for apps, and should be easy for widget crates to switch to. See ratatui/ratatui#1388 for more details.