updating github.com/godbus/dbus to v4.1.0+incompatible

vendor/github.com/godbus/dbus/conn_darwin.go

@@ -2,20 +2,32 @@ package dbus
 
 import (
 	"errors"
+	"fmt"
+	"os"
 	"os/exec"
 )
 
-func sessionBusPlatform() (*Conn, error) {
+const defaultSystemBusAddress = "unix:path=/opt/local/var/run/dbus/system_bus_socket"
+
+func getSessionBusPlatformAddress() (string, error) {
 	cmd := exec.Command("launchctl", "getenv", "DBUS_LAUNCHD_SESSION_BUS_SOCKET")
 	b, err := cmd.CombinedOutput()
 
 	if err != nil {
-		return nil, err
+		return "", err
 	}
 
 	if len(b) == 0 {
-		return nil, errors.New("dbus: couldn't determine address of session bus")
+		return "", errors.New("dbus: couldn't determine address of session bus")
 	}
 
-	return Dial("unix:path=" + string(b[:len(b)-1]))
+	return "unix:path=" + string(b[:len(b)-1]), nil
+}
+
+func getSystemBusPlatformAddress() string {
+	address := os.Getenv("DBUS_LAUNCHD_SESSION_BUS_SOCKET")
+	if address != "" {
+		return fmt.Sprintf("unix:path=%s", address)
+	}
+	return defaultSystemBusAddress
 }