upgrade to react 17

[TomasSlama]

Hi,

  events.forEach(event => {
      childRef.current.addEventListener(event, hydrate, {
        once: true,
        capture: true,
        passive: true
      });
      cleanupFns.push(() => {
        childRef.current.removeEventListener(event, hydrate, { capture: true });
      });
    });

this part of code needs to be refactored so we can upgrade to react 17

https://reactjs.org/blog/2020/08/10/react-v17-rc.html#potential-issues