chore(deps): update dependency @next/mdx to v14.2.8

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@next/mdx (source)	14.2.7 -> 14.2.8

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Release Notes

vercel/next.js (@​next/mdx)

### [`v14.2.8`](https://redirect.github.com/vercel/next.js/compare/v14.2.7...v14.2.8) [Compare Source](https://redirect.github.com/vercel/next.js/compare/v14.2.7...v14.2.8)

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Configuration

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♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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[changeset-bot[bot]]

⚠️ No Changeset found

Latest commit: 0d73ea185256c9cb5001b2a7601826af113adbcb

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[coveralls]

coverage: 92.494%. remained the same when pulling 0d73ea185256c9cb5001b2a7601826af113adbcb on renovate/nextjs-monorepo into 3edf63dbaf4be17bf771cf98430f8bc7febc4edf on main.