don't set the TLS version in the transport

This is already done in the crypto setup.

transport.go

@@ -191,7 +191,6 @@ func (t *Transport) dial(ctx context.Context, addr net.Addr, host string, tlsCon
  onClose = func() { t.Close() }
  }
  tlsConf = tlsConf.Clone()
- tlsConf.MinVersion = tls.VersionTLS13
  setTLSConfigServerName(tlsConf, addr, host)
  return dial(ctx, newSendConn(t.conn, addr, packetInfo{}, utils.DefaultLogger), t.connIDGenerator, t.handlerMap, tlsConf, conf, onClose, use0RTT)
 }