fix(deps): update nextjs monorepo to v16.3.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
eslint-config-next (source)	16.3.7 → 16.3.8
next (source)	16.3.7 → 16.3.8

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Release Notes

vercel/next.js (eslint-config-next)

v16.3.8

Compare Source

This release contains security fixes for the following advisories:

High:

• Server-Side Request Forgery in Image Optimization

Medium:

• Information disclosure in Next.js App Router metadata image routes via dynamicParams bypass
• Cache poisoning of SSG and ISR pages in self-hosted Next.js applications
• Cache poisoning in Next.js SSG/ISR rendering leads to cross-user content substitution and persistent denial of service
• Pending use cache fill can leak Draft Mode content into regular responses and persisted pages
• Cache leak across root param values in nested 'use cache' functions

Low:

• Information disclosure in the Next.js development server's Model Context Protocol endpoint

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