SplitHTTP: Remove unnecessary keepalives (#3565)

Remove keep alive since quic-go/http3 doesn't support stream reuse
Discussion see https://t.me/projectXray/3782492

Co-authored-by: Fangliding <Fangliding.fshxy@outlook.com>
Co-authored-by: xqzr <34030394+xqzr@users.noreply.github.com>
Co-authored-by: ll11l1lIllIl1lll <88377095+ll11l1lIllIl1lll@users.noreply.github.com>

transport/internet/splithttp/dialer.go

@@ -87,15 +87,8 @@ func getHTTPClient(ctx context.Context, dest net.Destination, streamSettings *in
 
 	if isH3 {
 		dest.Network = net.Network_UDP
-		quicConfig := &quic.Config{
-			HandshakeIdleTimeout: 10 * time.Second,
-			MaxIdleTimeout:       90 * time.Second,
-			KeepAlivePeriod:      3 * time.Second,
-			Allow0RTT:            true,
-		}
 		roundTripper := &http3.RoundTripper{
 			TLSClientConfig: gotlsConfig,
-			QUICConfig:      quicConfig,
 			Dial: func(ctx context.Context, addr string, tlsCfg *gotls.Config, cfg *quic.Config) (quic.EarlyConnection, error) {
 				conn, err := internet.DialSystem(ctx, dest, streamSettings.SocketSettings)
 				if err != nil {