Make backwards compatible

Author: kasperpeulen

code/frameworks/nextjs-vite-rsc/src/rsc/headers.ts

@@ -3,5 +3,5 @@ import { HeadersAdapter } from 'next/dist/server/web/spec-extension/adapters/hea
 import { RequestCookiesAdapter } from 'next/dist/server/web/spec-extension/adapters/request-cookies';
 
 const headersAdapter = new HeadersAdapter({});
-export const headers = async () => headersAdapter;
-export const cookies = async () => RequestCookiesAdapter.seal(new RequestCookies(headersAdapter));
+export const headers = () => headersAdapter;
+export const cookies = () => RequestCookiesAdapter.seal(new RequestCookies(headersAdapter));