Switch back go upstream bwmarrin/discordgo

Commit https://github.com/bwmarrin/discordgo/commit/ffa9956c9b41e8e2a10c26a254389854e016b006 got merged in.

vendor/golang.org/x/crypto/ssh/streamlocal.go

@@ -32,6 +32,7 @@ type streamLocalChannelForwardMsg struct {
 
 // ListenUnix is similar to ListenTCP but uses a Unix domain socket.
 func (c *Client) ListenUnix(socketPath string) (net.Listener, error) {
+	c.handleForwardsOnce.Do(c.handleForwards)
 	m := streamLocalChannelForwardMsg{
 		socketPath,
 	}