Update Rust crate tabled to 0.21

[renovate]

This PR contains the following updates:

Package	Type	Change
tabled	workspace.dependencies	0.20 → 0.21

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Release Notes

zhiburt/tabled (tabled)

v0.21.0

Added

• Added Color::is_empty function (by @​mvanhorn).
• Added Settings::modify function (by @​mvanhorn).
• Added qc test for wrap (by @​mvanhorn).
• Added LineText::limit function (by @​mvanhorn).
• Added ColumnNames::padding.

Changed

• Reworked Charset (by @​mvanhorn).
• Removed TabSize in favor of Charset::tab_size().
• Changed ColumnNames interface - splited it into ColumnNames and RowNames.

Fixed

• Fixed Wrap strings with 0 width (by @​ymcx).
• Improved examples (by @​alexanderkjall).
• Remove broken LICENSE symlink (by @​mvanhorn).
• Fixed CHANGELOG.md (by @​mvanhorn).
• Fixed clippy issue (by @​akiomik).
• Fixed documentation (by @​akiomik).
• Fixed documentation (by @​darko-mesaros).
• Fixed documentation (by @​brownjohnf).
• Fixed documentation (by @​spiritualhost).
• Fixed wrong render of vertical char in case of Span (corner case).
• Fixed BorderCorrection::span when Span::column and Span::row is used for same cell (corner case).

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