Update dependency @mdx-js/react to v2

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@mdx-js/react (source)	^1.6.21 -> ^2.0.0

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Release Notes

mdx-js/mdx

v2.0.0

Compare Source

Welcome to MDX 2! See the of the website for everything:

• MDX 2: https://mdxjs.com/blog/v2/
• Migrating: https://mdxjs.com/migrating/v2/

Changelog since last RC

##### `@mdx-js/mdx`

• 4a48f1f Fix custom elements (#​1911)

@mdx-js/react

• 9ca9d40 Fix unnecessary top-level context changes (#​1924)

@mdx-js/loader

• e0b697a 9d5501b Add improved webpack cache (#​1912, #​1916)

@mdx-js/esbuild

• 5c61f57 Fix resolve base in esbuild loader (#​1854)

remark-mdx

• a5daaad Update mdast-util-mdx (#​1925)

#### New Contributors

Thanks @​redallen, @​lonyele, @​PaulieScanlon, @​pd4d10, @​Gowee, @​mskelton, @​ihupoo, @​remcohaszing, @​loreanvictor, @​ChrisChinchilla, @​glitteringkatie, @​mvasilkov, @​jablko, @​michaeloliverx, @​yordis, @​rodrez, @​imballinst, @​gaearon.

Full Changelog: https://github.com/mdx-js/mdx/compare/v1.6.3...2.0.0

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