Update dependency @astrojs/tailwind to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@astrojs/tailwind (source)	^5.1.4 → ^6.0.0

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Release Notes

withastro/astro (@​astrojs/tailwind)

v6.0.2

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Patch Changes

• #​13505 a98ae5b Thanks @​ematipico! - Updates the dependency vite to the latest.

v6.0.1

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Patch Changes

• #​13471 020c542 Thanks @​delucis! - Updates the README to indicate that the Tailwind integration is deprecated

v6.0.0

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Major Changes

• #​13049 2ed4bd9 Thanks @​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.

  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.

v5.1.5

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Patch Changes

• #​13011 cf30880 Thanks @​ascorbic! - Upgrades Vite

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