Update index.d.ts

Make .lean() return Query<any> so we can properly cast it to whatever we need

types/mongoose/index.d.ts

@@ -1598,7 +1598,7 @@ declare module "mongoose" {
      * getters/setters or other Mongoose magic applied.
      * @param bool defaults to true
      */
-    lean(bool?: boolean): Query<object>;
+    lean(bool?: boolean): Query<any>;
 
     /** Specifies the maximum number of documents the query will return. Cannot be used with distinct() */
     limit(val: number): this;