const github.com/refraction-networking/utls/dicttls.QUICTransportParameter_google_version

one use

	github.com/refraction-networking/utls/dicttls (current package)
		quic_transport_parameters.go#L32: 	QUICTransportParameter_google_version                      uint64 = 0x4752 // Google: Google QUIC version downgrade prevention