By Michael Tedder But the star hints at a return with a different act sometime in the future. Las Vegas’ post covid comeback has been rolling along lately. But soon, it might lose a headliner who has made Sin City her base of operations for the past year. For most of the 20th century, the phrase a “Vegas residency” usually brought to mind the image of a crooner like, say, Perry Cuomo, an artist in advancing years there to serve up a gentle musical style that won’t jostle the retirees who flock to Vegas that much. And, to be clear, there’s nothing wrong with that. Retirees have just as much rig…