chore: update adapter vercel

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[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
themes.skeleton.dev	Building	Preview	Comment	Oct 13, 2025 4:08pm
www.skeleton.dev	Building	Preview	Comment	Oct 13, 2025 4:08pm

[Copilot]

Pull Request Overview

This PR updates the Vercel adapter configuration to explicitly specify a Node.js runtime version.

• Adds runtime specification to the Vercel adapter configuration

Files not reviewed (1)

• sites/skeleton.dev/pnpm-lock.yaml: Language not supported

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