fix: make legacy fields in package.json valid

[benmccann]

Marked version: 4.2.12

Markdown flavor: n/a

Description

• Fixes module import/export issue #2265 (this issue is closed, but you can see people still complaining in the comments)

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[laustdeleuran]

I'm not completely sure what error reports from #2265 this is intended to fix, but I tried changing the same lines in my node_modules folder to correspond with the changes proposed in this PR, and I'm still getting the same error.