chore: fix test

Author: ascorbic

packages/next/test/request.spec.ts

@@ -1,6 +1,6 @@
 import Chance from 'chance'
 import { NextURL } from 'next/dist/server/web/next-url'
-import { NextCookies } from 'next/dist/server/web/spec-extension/cookies'
+import { RequestCookies } from 'next/dist/server/web/spec-extension/cookies'
 import { NextRequest } from 'next/server'
 import { MiddlewareRequest } from '../src/middleware/request'
 
@@ -93,7 +93,7 @@ describe('MiddlewareRequest', () => {
 
   it('returns the cookies object', () => {
     const mwRequest = new MiddlewareRequest(nextRequest)
-    expect(mwRequest.cookies).toBeInstanceOf(NextCookies)
+    expect(mwRequest.cookies).toBeInstanceOf(RequestCookies)
   })
 
   it('returns the geo object', () => {