Fix QUIC disconnecting issue (#475)

Co-authored-by: RPRX <63339210+rprx@users.noreply.github.com>

transport/internet/quic/hub.go

@@ -103,7 +103,7 @@ func Listen(ctx context.Context, address net.Address, port net.Port, streamSetti
 
 	quicConfig := &quic.Config{
 		ConnectionIDLength:    12,
-		MaxIdleTimeout:        time.Second * 45,
+		KeepAlive:             true,
 		MaxIncomingStreams:    32,
 		MaxIncomingUniStreams: -1,
 	}