Fix re-export bug

Author: colinhacks

packages/zod/src/index.ts

@@ -1,4 +1,4 @@
-import * as z from "./v3/index.js";
-export * from "./v3/index.js";
+import * as z from "./v3/external.js";
+export * from "./v3/external.js";
 export { z };
 export default z;