use dataFetcher itself as the key for the weakmap

packages/gitbook-v2/src/lib/data/memoize.ts

@@ -1,20 +1,17 @@
-import { cache } from 'react';
-
-// This is used to create a context specific to the current request.
-// This version works both in cloudflare and in vercel.
-const getRequestContext = cache(() => ({}));
+import type { GitBookDataFetcher } from './types';
 
 /**
  * Wrap a function by preventing concurrent executions of the same function.
  * With a logic to work per-request in Cloudflare Workers.
  */
 export function withoutConcurrentExecution<ArgsType extends any[], ReturnType>(
+    dataFetcherObject: GitBookDataFetcher,
     wrapped: (key: string, ...args: ArgsType) => Promise<ReturnType>
 ): (cacheKey: string, ...args: ArgsType) => Promise<ReturnType> {
     const globalPromiseCache = new WeakMap<object, Map<string, Promise<ReturnType>>>();
 
     return (key: string, ...args: ArgsType) => {
-        const globalContext = getRequestContext();
+        const globalContext = dataFetcherObject;
 
         /**
          * Cache storage that is scoped to the current request when executed in Cloudflare Workers,