Update index.js

[yashhhYB]

Creating an optimized production build... (node:3428) [DEP0060] DeprecationWarning: The `util._extend` API is deprecated. Please use Object.assign() instead.

Failed to compile.

Module not found: Error: Can't resolve './cjs/react-dom-client.production.js' in 'D:\contributions\react\fixtures\concurrent\time-slicing\node_modules\react-dom'

Summary

How did you test this change?

Changed import from: import {createRoot} from 'react-dom/client';

to: import {unstable_createRoot} from 'react-dom';

Changed usage from: const root = createRoot(container);

to: const root = unstable_createRoot(container);

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