attach the QUIC version to context returned by ClientHelloInfo.Context (#3721)

internal/handshake/interface.go

@@ -3,7 +3,6 @@ package handshake
 import (
 	"errors"
 	"io"
-	"net"
 	"time"
 
 	"github.com/quic-go/quic-go/internal/protocol"
@@ -93,10 +92,3 @@ type CryptoSetup interface {
 	Get0RTTSealer() (LongHeaderSealer, error)
 	Get1RTTSealer() (ShortHeaderSealer, error)
 }
-
-// ConnWithVersion is the connection used in the ClientHelloInfo.
-// It can be used to determine the QUIC version in use.
-type ConnWithVersion interface {
-	net.Conn
-	GetQUICVersion() protocol.VersionNumber
-}