chore(deps): update tailwindcss monorepo to v4.2.1 (#467)

This PR contains the following updates:

| Package | Change |
[Age](https://docs.renovatebot.com/merge-confidence/) |
[Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [@tailwindcss/postcss](https://tailwindcss.com)
([source](https://redirect.github.com/tailwindlabs/tailwindcss/tree/HEAD/packages/@tailwindcss-postcss))
| [`4.2.0` →
`4.2.1`](https://renovatebot.com/diffs/npm/@tailwindcss%2fpostcss/4.2.0/4.2.1)
|
![age](https://developer.mend.io/api/mc/badges/age/npm/@tailwindcss%2fpostcss/4.2.1?slim=true)
|
![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/@tailwindcss%2fpostcss/4.2.0/4.2.1?slim=true)
|
| [tailwindcss](https://tailwindcss.com)
([source](https://redirect.github.com/tailwindlabs/tailwindcss/tree/HEAD/packages/tailwindcss))
| [`4.2.0` →
`4.2.1`](https://renovatebot.com/diffs/npm/tailwindcss/4.2.0/4.2.1) |
![age](https://developer.mend.io/api/mc/badges/age/npm/tailwindcss/4.2.1?slim=true)
|
![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/tailwindcss/4.2.0/4.2.1?slim=true)
|

---

### Release Notes

<details>
<summary>tailwindlabs/tailwindcss
(@&#8203;tailwindcss/postcss)</summary>

###
[`v4.2.1`](https://redirect.github.com/tailwindlabs/tailwindcss/blob/HEAD/CHANGELOG.md#421---2026-02-23)

[Compare
Source](https://redirect.github.com/tailwindlabs/tailwindcss/compare/v4.2.0...v4.2.1)

##### Fixed

- Allow trailing dash in functional utility names for backwards
compatibility
([#&#8203;19696](https://redirect.github.com/tailwindlabs/tailwindcss/pull/19696))
- Properly detect classes containing `.` characters within curly braces
in MDX files
([#&#8203;19711](https://redirect.github.com/tailwindlabs/tailwindcss/pull/19711))

</details>

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