[core] Add comment that lab should be in alpha

[oliviertassinari]

I don't know what happened, but the lab should be in the "alpha" per https://www.notion.so/mui-org/React-Major-version-release-process-0178410ef26941e6a4f333f80ded127a?pvs=4#76b607ce98cf45a49730f2af04e18dd3. It's not the case https://www.npmjs.com/package/@mui/lab?activeTab=versions. Adding a comment for Material UI v8.

(The // is from https://stackoverflow.com/questions/14221579/how-do-i-add-comments-to-package-json-for-npm-install)

A bit related to #40662.

[mui-bot]

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[oliviertassinari]

It's a quick win, merging.