Update dependency @next/mdx to v12.3.7

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@next/mdx (source)	12.3.1 -> 12.3.7

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Release Notes

vercel/next.js (@​next/mdx)

v12.3.7

Compare Source

[!NOTE]
This release is backporting bug fixes. It does not include all pending features/changes on canary.

Core Changes

• Lock swc binaries version

v12.3.6

Compare Source

[!NOTE]
This release is backporting bug fixes. It does not include all pending features/changes on canary.

Core Changes

• Match subrequest handling for edge and node
• Update publish-native

v12.3.5

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

• [backport] middleware subrequest patch (#​77424)

v12.3.4

Compare Source

v12.3.3

Compare Source

v12.3.2

Compare Source

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[github-actions]

Thanks for submitting this PR!

Unfortunately, it has some linter errors, so we can't merge it yet. Can you please fix them?

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