Update site dependencies

[ChristianMurphy]

This updates the playground, give it a try in the Vercel preview below.

resolves #2061
resolves #2060

[vercel]

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Name	Status	Preview	Comments	Updated
mdx	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Feb 7, 2023 at 8:22PM (UTC)

[wooorm]

Looks like syntax highlighting doesn’t work: https://mdx-git-fork-christianmurphy-codemirror-6-mdx.vercel.app/playground/ anymore. I see some errors in the console from codemirror too

[ChristianMurphy]

Thanks!
Took a bit to track that down.
Turns out the package lock file needs to be explicitly deduplicated when updating codemirror to ensure all the packages land on compatible versions.

[ChristianMurphy]

Well, good news it fixed the site. 🎉
Bad news, it turned up a conflict between https://github.com/syntax-tree/estree-util-to-js/releases/tag/1.1.1 and vFile
and some changes to uvu and esbuild which appear to break us 😅

[ChristianMurphy]

With a bit of lockfile surgery both the website and tests look happy.
Instead of a general npm upgrade, it uses npm update {individual codemirror package names} followed by npm dedupe.

[wooorm]

Thank you!