⬆️ upgrade nextjs monorepo to v15.2.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@next/mdx (source)	15.2.2 -> 15.2.3
eslint-config-next (source)	15.2.2 -> 15.2.3

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Release Notes

vercel/next.js (@​next/mdx)

v15.2.3

Compare Source

[!NOTE]
This release is backporting bug fixes. It does not include all pending features/changes on canary.
This release contains a security patch for CVE-2025-29927.

Core Changes

• Update default allowed origins list (#​77212)
• unify allowed origin detection handling (#​77053)
• Add dev warning for cross-origin and stabilize allowedDevOrigins (#​77044)
• Ensure deploymentId is used for CSS preloads (#​77210)
• Update middleware request header (#​77201)
• [metadata] remove the default segement check for metadata rendering (#​77119)
• [ts-hint] fix vscode type hint plugin enabling (#​77099)
• [metadata] re-insert icons to head for streamed metadata (#​76915)

Credits

Huge thanks to @​ijjk, @​ztanner, and @​huozhi for helping!

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

v15.2.3

Compare Source

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Configuration

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