Update ttrpc to 94dde388801693c54f88a6596f713b51a8

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

cmd/containerd-shim/main_unix.go

@@ -172,7 +172,7 @@ func serve(server *ttrpc.Server, path string) error {
 	logrus.WithField("socket", path).Debug("serving api on unix socket")
 	go func() {
 		defer l.Close()
-		if err := server.Serve(l); err != nil &&
+		if err := server.Serve(context.Background(), l); err != nil &&
 			!strings.Contains(err.Error(), "use of closed network connection") {
 			logrus.WithError(err).Fatal("containerd-shim: ttrpc server failure")
 		}