[core] Project classic gets deprecated, migrate

[oliviertassinari]

Steps to reproduce

https://github.com/search?q=org%3Amui+https%3A%2F%2Fgithub.heygears.com%2Fmui%2Fmui-x%2Fprojects%2F1&type=code

Current behavior

Link to https://github.com/mui/mui-x/projects/1

Expected behavior

Link to https://github.com/orgs/mui/projects/35

Context

No response

Your environment

npx @mui/envinfo

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  Output from `npx @mui/envinfo` goes here.

Search keywords: -

[michelengelen]

@oliviertassinari with these 2 PRs we should be fine, right?

[oliviertassinari]

@michelengelen Yes, as far as I know 👍

[github-actions]

⚠️ This issue has been closed. If you have a similar problem but not exactly the same, please open a new issue.
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