breaking: Replace kleur with styleText

[sidharthv96]

• Replace kleur with node:util's native styleText
• Upgrade node minimum requirement from v18.13 to v20.13

Resolves: #12396

Creating as draft, to check if the node upgrade PR should be separate from this. Will create changesets after this is confirmed.

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[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 1fa0ddae7e9dc8baa1613e668b6a064730613889

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@sveltejs/package	Major
@sveltejs/kit	Major

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Click here if you're a maintainer who wants to add another changeset to this PR

[benmccann]

@sidharthv96 we'll probably start working on SvelteKit 3 before too long and will be able to merge this if you'd like to address the merge conflicts

[sidharthv96]

Will do, over the weekend!