Revert "Remove index.js suffix of use-sync-external-store/shim to support React Native" (#2802)

Author: huozhi

core/src/use-swr.ts

@@ -5,7 +5,7 @@ import ReactExports, {
   useDebugValue,
   useMemo
 } from 'react'
-import { useSyncExternalStore } from 'use-sync-external-store/shim'
+import { useSyncExternalStore } from 'use-sync-external-store/shim/index.js'
 
 import {
   defaultConfig,

infinite/src/index.ts

@@ -33,7 +33,7 @@ import type {
   SWRInfiniteCacheValue,
   SWRInfiniteCompareFn
 } from './types'
-import { useSyncExternalStore } from 'use-sync-external-store/shim'
+import { useSyncExternalStore } from 'use-sync-external-store/shim/index.js'
 import { getFirstPageKey } from './serialize'
 
 // const INFINITE_PREFIX = '$inf$'