Update Rust crate tabled to 0.21.0 (#8184)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [tabled](https://redirect.github.com/zhiburt/tabled) |
workspace.dependencies | minor | `0.20.0` → `0.21.0` |

---

> [!WARNING]
> Some dependencies could not be looked up. Check the [Dependency
Dashboard](../issues/357) for more information.

---

### Release Notes

<details>
<summary>zhiburt/tabled (tabled)</summary>

###
[`v0.21.0`](https://redirect.github.com/zhiburt/tabled/blob/HEAD/CHANGELOG.md#0210---2026-06-01)

##### Added

- Added `Color::is_empty` function (by
[@&#8203;mvanhorn](https://redirect.github.com/mvanhorn)).
- Added `Settings::modify` function (by
[@&#8203;mvanhorn](https://redirect.github.com/mvanhorn)).
- Added qc test for wrap (by
[@&#8203;mvanhorn](https://redirect.github.com/mvanhorn)).
- Added `LineText::limit` function (by
[@&#8203;mvanhorn](https://redirect.github.com/mvanhorn)).
- Added `ColumnNames::padding`.

##### Changed

- Reworked `Charset` (by
[@&#8203;mvanhorn](https://redirect.github.com/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
[@&#8203;ymcx](https://redirect.github.com/ymcx)).
- Improved examples (by
[@&#8203;alexanderkjall](https://redirect.github.com/alexanderkjall)).
- Remove broken LICENSE symlink (by
[@&#8203;mvanhorn](https://redirect.github.com/mvanhorn)).
- Fixed CHANGELOG.md (by
[@&#8203;mvanhorn](https://redirect.github.com/mvanhorn)).
- Fixed clippy issue (by
[@&#8203;akiomik](https://redirect.github.com/akiomik)).
- Fixed documentation (by
[@&#8203;akiomik](https://redirect.github.com/akiomik)).
- Fixed documentation (by
[@&#8203;darko-mesaros](https://redirect.github.com/darko-mesaros)).
- Fixed documentation (by
[@&#8203;brownjohnf](https://redirect.github.com/brownjohnf)).
- Fixed documentation (by
[@&#8203;spiritualhost](https://redirect.github.com/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).

</details>

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Cargo.lock

@@ -243,7 +243,7 @@ static_assertions = "1.1"
 strum = "0.28"
 syn = { version = "2.0.117", features = ["full"] }
 sysinfo = "0.38.0"
-tabled = { version = "0.20.0", default-features = false }
+tabled = { version = "0.21.0", default-features = false }
 taffy = "0.10.0"
 take_mut = "0.2.2"
 tar = "0.4"