[Docs Site] Bump @astrojs/tailwind from 5.1.5 to 6.0.0

Bumps [@astrojs/tailwind](https://github.com/withastro/astro/tree/HEAD/packages/integrations/tailwind) from 5.1.5 to 6.0.0.
- [Release notes](https://github.com/withastro/astro/releases)
- [Changelog](https://github.com/withastro/astro/blob/main/packages/integrations/tailwind/CHANGELOG.md)
- [Commits](https://github.com/withastro/astro/commits/@astrojs/[email protected]/packages/integrations/tailwind)

---
updated-dependencies:
- dependency-name: "@astrojs/tailwind"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -35,7 +35,7 @@
 		"@astrojs/starlight": "0.32.2",
 		"@astrojs/starlight-docsearch": "0.6.0",
 		"@astrojs/starlight-tailwind": "3.0.0",
-		"@astrojs/tailwind": "5.1.5",
+		"@astrojs/tailwind": "6.0.0",
 		"@cloudflare/vitest-pool-workers": "0.7.7",
 		"@cloudflare/workers-types": "4.20250310.0",
 		"@codingheads/sticky-header": "1.0.2",