Upgrade to unhead v3

[innocenzi]

Package

v4.x

Description

I just upgraded to the latest version of Nuxt UI, which includes this PR. It calls a @unhead/vue@v2 API directly, which crashes in Vue apps where v3 is used.

Additional context

No response

[coderabbitai]

🔗 Related PRs

#6495 - fix(Icon): avoid recursive icon resolution [merged]
#6577 - fix(module): remove inline script in SPA mode for strict CSP [merged]

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