Update id/auth client

vendor/git.autistici.org/id/auth/client/client.go

@@ -28,14 +28,21 @@ func New(socketPath string) Client {
 }
 
 func (c *socketClient) Authenticate(ctx context.Context, req *auth.Request) (*auth.Response, error) {
+	// Create the connection outside of the timed goroutine, so
+	// that we can call Close() on exit regardless of the reason:
+	// this way, when a timeout occurs or the context is canceled,
+	// the pending request terminates immediately.
 	conn, err := textproto.Dial("unix", c.socketPath)
 	if err != nil {
 		return nil, err
 	}
 	defer conn.Close()
 
+	// Make space in the channel for at least one element, or we
+	// will leak a goroutine whenever the authentication request
+	// times out.
+	done := make(chan error, 1)
 	var resp auth.Response
-	done := make(chan error)
 
 	go func() {
 		defer close(done)

vendor/vendor.json

@@ -29,14 +29,14 @@
 		{
 			"checksumSHA1": "6D5Xt9WoGSeTJE3XFw6P2/nKYrQ=",
 			"path": "git.autistici.org/id/auth",
-			"revision": "d5da26d7565082baa108a1c1806f2fc723d33ccb",
-			"revisionTime": "2018-11-18T17:43:45Z"
+			"revision": "1276ec2bd95945ea45a8680a15b76cad8a339096",
+			"revisionTime": "2018-11-22T22:30:45Z"
 		},
 		{
-			"checksumSHA1": "48njEQBB73cV6tTPBEOnzSVRjeA=",
+			"checksumSHA1": "t3JTZ0bAMQit79HYbcEykC8uxro=",
 			"path": "git.autistici.org/id/auth/client",
-			"revision": "d5da26d7565082baa108a1c1806f2fc723d33ccb",
-			"revisionTime": "2018-11-18T17:43:45Z"
+			"revision": "1276ec2bd95945ea45a8680a15b76cad8a339096",
+			"revisionTime": "2018-11-22T22:30:45Z"
 		},
 		{
 			"checksumSHA1": "MlpsZgRytv/c9IX9YawRJDN/ibQ=",