Fix mdx test fail with rehype-pretty-code

[bluwy]

Changes

We're using shiki 1.0, and rehype-pretty-code has a peer dep on shiki, so we also need to bump rehype-pretty-code to latest so it supports shiki 1.0. This is not a breaking change for Astro since existing users of rehype-pretty-code can install shiki 0.x locally to continue have it work.

Testing

Ran the mdx tests locally.

Docs

n/a

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