const crypto/tls.alertProtocolVersion

7 uses

	crypto/tls (current package)
		alert.go#L36: 	alertProtocolVersion              alert = 70
		alert.go#L72: 	alertProtocolVersion:              "protocol version not supported",
		conn.go#L625: 		c.sendAlert(alertProtocolVersion)
		conn.go#L632: 		c.sendAlert(alertProtocolVersion)
		handshake_client.go#L357: 		c.sendAlert(alertProtocolVersion)
		handshake_client_tls13.go#L45: 		c.sendAlert(alertProtocolVersion)
		handshake_server.go#L157: 		c.sendAlert(alertProtocolVersion)

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