[v2] breaking: require react 18 and drop use-sync-external-store

[dai-shi]

For #810

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Name	Status	Preview	Comments	Updated (UTC)
valtio	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 13, 2023 1:06pm

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Latest deployment of this branch, based on commit e55f1e8b5993630511156da3d6484f7d972c67c2:

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React TypeScript	Configuration
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Size Change: -168 B (0%)

Total Size: 42.4 kB

Filename	Size	Change
dist/react.js	626 B	-31 B (-5%)	✅
dist/system/react.development.js	815 B	-36 B (-4%)
dist/system/react.production.js	426 B	-33 B (-7%)	✅
dist/umd/react.development.js	763 B	-38 B (-5%)	✅
dist/umd/react.production.js	490 B	-30 B (-6%)	✅

ℹ️ View Unchanged

| Filename | Size | | :--- | :---: | | `dist/index.js` | 243 B | | `dist/macro.js` | 919 B | | `dist/macro/vite.js` | 1.08 kB | | `dist/react/utils.js` | 244 B | | `dist/system/index.development.js` | 236 B | | `dist/system/index.production.js` | 170 B | | `dist/system/macro.development.js` | 779 B | | `dist/system/macro.production.js` | 556 B | | `dist/system/macro/vite.development.js` | 951 B | | `dist/system/macro/vite.production.js` | 660 B | | `dist/system/react/utils.development.js` | 321 B | | `dist/system/react/utils.production.js` | 223 B | | `dist/system/utils.development.js` | 241 B | | `dist/system/utils.production.js` | 176 B | | `dist/system/vanilla.development.js` | 2.46 kB | | `dist/system/vanilla.production.js` | 1.42 kB | | `dist/system/vanilla/utils.development.js` | 3.32 kB | | `dist/system/vanilla/utils.production.js` | 2.2 kB | | `dist/umd/index.development.js` | 382 B | | `dist/umd/index.production.js` | 330 B | | `dist/umd/macro.development.js` | 1.03 kB | | `dist/umd/macro.production.js` | 721 B | | `dist/umd/macro/vite.development.js` | 1.23 kB | | `dist/umd/macro/vite.production.js` | 879 B | | `dist/umd/react/utils.development.js` | 400 B | | `dist/umd/react/utils.production.js` | 299 B | | `dist/umd/utils.development.js` | 398 B | | `dist/umd/utils.production.js` | 344 B | | `dist/umd/vanilla.development.js` | 2.62 kB | | `dist/umd/vanilla.production.js` | 1.53 kB | | `dist/umd/vanilla/utils.development.js` | 3.91 kB | | `dist/umd/vanilla/utils.production.js` | 2.48 kB | | `dist/utils.js` | 247 B | | `dist/vanilla.js` | 2.5 kB | | `dist/vanilla/utils.js` | 3.75 kB |

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