Warning of ReactDOM.hydrate from react 18 alpha release

[huozhi]

What version of Next.js are you using?

11.0.1

What version of Node.js are you using?

16.0.0

What browser are you using?

Chrome

What operating system are you using?

macOS

How are you deploying your application?

codesanbox

Describe the Bug

Testing next.js with swr@beta, saw this warning in the console

Warning: ReactDOM.hydrate is no longer supported in React 18. Use createRoot instead. Until you switch to the new API, your app will behave as if it's running React 17. Learn more: https://reactjs.org/link/switch-to-createroot

Expected Behavior

React 18 hydrate correctly without seeing any warnings

To Reproduce

Create a new next.js app with next.js 11.0.1 and react & react-dom 18.0.0-alpha-e6be2d531

[balazsorban44]

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