fix: downgrade mdast-util-mdx-expression

[maximilianfalco]

	Fix RM-XYZ

🧰 Changes

We were seeing a weird minor regression when publishing the new mdxish engine. The new engine used mdast-util-mdx-expression v2.0.1 instead of v2.0.0 which was used as a dependency for the old mdx engine (via remarkMdx if not mistaken). While the mdx pipeline remained untouched, using v2.0.1 in mdxish unintentionally caused the old mdx engine to also use this newer version... this introduced a slight bug (Im not sure if this was intentional) where it would indent expressions, including JSX comments when de- or serializing.

What would usually be something like

{/*

## Hey-o

*/}

would become

{/*

  ## Hey-o

  */}

This is a short demo showcase of the bug:

Screen.Recording.2025-12-06.at.17.54.17.mov

Ive managed to trace the origin of this behaviour to this commit WITHIN the plugin library itself. Reverting back to v2.0.0 seems to work for now. Ive added a check against this to make sure this does not happen in the future.

Important

We need to make sure future work regarding mdx or mdxish uses the correct v2.0.0 version of mdast-util-mdx-expression

🧬 QA & Testing

• Broken on production.
• Working in this PR app.

[rafegoldberg]

Bummer that such a minor bump would futz with formatting like that; alas…

[rafegoldberg]

This PR was released!

🚀 Changes included in v11.8.1