[enhanced-img] Moved estree-walker from dev dependencies to dependencies

[marekdedic]

This PR fixes #12920.

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[marekdedic]

Hmm, one of the tests fails but I don't see any clear error message... Any help here?

[benmccann]

#12822 would probably also fix this by moving off of estree-walker

[benmccann]

thanks for this!

will close it though as I merged #12822