remove reference to the removed file

Author: Feiyang1

packages/util/index.node.ts

@@ -33,5 +33,4 @@ export * from './src/obj';
 export * from './src/query';
 export * from './src/sha1';
 export * from './src/subscribe';
-export * from './src/validation';
 export * from './src/utf8';