FastAPI WebSocket instance differs between handler and Dishka

[egorzh01]

When WebSocket is accepted in the handler, the instance provided by dishka remains unaccepted because they are different objects.
At the same time if you try to send a message using the instance provided by Dishka, it will raise an err.

solution is taking dishka websocket instance in handler

@router.websocket("/")
@inject
async def ws(
     _: WebSocket, # hack from #575
    ws: FromDishka[WebSocket],
) -> None: