fix: fix mobx-react-lite release issue, fixes #3662

[mweststrate]

Running prepublish locally on an empty check-out fails the mobx-react-lite build, as the types are nog generated when mobx itself hasn't been build:

(typescript) Error: /Users/mweststrate/Desktop/mobx/packages/mobx-react-lite/src/useLocalStore.ts(1,28): semantic error TS2307: Cannot find module 'mobx' or its corresponding type declarations.
Error: /Users/mweststrate/Desktop/mobx/packages/mobx-react-lite/src/useLocalStore.ts(1,28): semantic error TS2307: Cannot find module 'mobx' or its corresponding type declarations.

Fixed it by forcing a MobX build in the prepublish script

[changeset-bot]

🦋 Changeset detected

Latest commit: bda13bd

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

This PR includes changesets to release 1 package

Name	Type
mobx-react-lite	Patch

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[urugator]

Thank you. I still quite don't undestand the problem - why it used to work or why mobx-react doesn't have to do that ...

[mweststrate]

My suspicion is that it depends on the order in which the publish commands are executed. But that order seems to be determined by Lerna and not by us.