fix(UploadDragger): fix UploadDrager no export (#4334)

Author: fanhaoyuan

components/components.ts

@@ -192,6 +192,6 @@ export {
 
 export type { UploadProps } from './upload';
 
-export { default as Upload } from './upload';
+export { default as Upload, UploadDragger } from './upload';
 
 export { default as LocaleProvider } from './locale-provider';