Winit version 0.30.4

Changed

• DeviceId::dummy() and WindowId::dummy() are no longer marked unsafe.

Fixed

• On Wayland, avoid crashing when compositor is misbehaving.
• On Web, fix WindowEvent::Resized not using requestAnimationFrame when sending
  WindowEvent::RedrawRequested and also potentially causing WindowEvent::RedrawRequested
  to not be de-duplicated.
• Account for different browser engine implementations of pointer movement coordinate space.