fix: prevent notification close buttons from submitting forms (#408)

Author: nrps9909

src/Notification.tsx

@@ -269,6 +269,7 @@ const Notification = React.forwardRef<HTMLDivElement, NotificationProps>((props,
 
       {mergedClosable && (
         <button
+          type="button"
           className={clsx(`${noticePrefixCls}-close`, classNames?.close)}
           aria-label="Close"
           {...closeBtnAriaProps}

tests/index.test.tsx

@@ -1333,5 +1333,9 @@ describe('Notification.Basic', () => {
       'aria-label',
       'xxx',
     );
+    expect(document.querySelector('button.rc-notification-notice-close')).toHaveAttribute(
+      'type',
+      'button',
+    );
   });
 });