fix(socketio/client): connect timeout panic under heavy traffic

[Totodore]

Motivation

Under heavy traffic, some desynchronisation between events might happen and then lead to panic with the connect timeout mechanism.
If a ns connect message is received, we stop the connect timeout task. But if the connect timeout task has been triggerred in the meantime the Receiver is dropped and the Sender will panic because we unwrap the send error tx.send(()).unwrap();.

Solution

Discard the error like that tx.send(()).ok();