Update dependency @astrojs/tailwind to v6 (#1596)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[@astrojs/tailwind](https://docs.astro.build/en/guides/integrations-guide/tailwind/)
([source](https://redirect.github.com/withastro/astro/tree/HEAD/packages/integrations/tailwind))
| [`5.1.5` ->
`6.0.0`](https://renovatebot.com/diffs/npm/@astrojs%2ftailwind/5.1.5/6.0.0)
|
[![age](https://developer.mend.io/api/mc/badges/age/npm/@astrojs%2ftailwind/6.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/@astrojs%2ftailwind/6.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/@astrojs%2ftailwind/5.1.5/6.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/@astrojs%2ftailwind/5.1.5/6.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>withastro/astro (@&#8203;astrojs/tailwind)</summary>

###
[`v6.0.0`](https://redirect.github.com/withastro/astro/blob/HEAD/packages/integrations/tailwind/CHANGELOG.md#600)

[Compare
Source](https://redirect.github.com/withastro/astro/compare/@astrojs/[email protected]...@astrojs/[email protected])

##### Major Changes

-
[#&#8203;13049](https://redirect.github.com/withastro/astro/pull/13049)
[`2ed4bd9`](https://redirect.github.com/withastro/astro/commit/2ed4bd90f25a3e5a183d0bc862e3b359b8289b93)
Thanks
[@&#8203;florian-lefebvre](https://redirect.github.com/florian-lefebvre)!
- Deprecates the integration

Tailwind CSS now offers a Vite plugin which is the preferred way to use
Tailwind 4 in Astro. Please uninstall `@astrojs/tailwind` and follow the
[Tailwind documentation for manual
installation](https://tailwindcss.com/docs/installation/framework-guides/astro).

This updated major version is only provided as a convenience for
existing projects until they are able to migrate to the new plugin. It
offers no additional functionality and is no longer recommended, but may
continue to be used in your projects until it is removed entirely.

</details>

---

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♻ **Rebasing**: Whenever PR is behind base branch, or you tick the
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🔕 **Ignore**: Close this PR and you won't be reminded about this update
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---

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---

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package.json

@@ -20,7 +20,7 @@
         "@astrojs/node": "9.0.2",
         "@astrojs/rss": "4.0.11",
         "@astrojs/sitemap": "3.2.1",
-        "@astrojs/tailwind": "5.1.5",
+        "@astrojs/tailwind": "6.0.0",
         "@fontsource/cantarell": "5.1.1",
         "@fontsource/jetbrains-mono": "5.1.2",
         "@fontsource/open-sans": "5.1.1",