Ditch deasync in 11ty plugin

[Brewd3v]

I was experiencing errors with de-async.

IDK if this is the best way of doing it, but worked for me.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 143e1161deeaf56c663767d00138132f343581cd

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
eleventy-plugin-shiki-twoslash	Patch

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