Melbourne, Australia punks Amyl and The Sniffers are back with a new stand-alone single, “U Should Not Be Doing That,” their first release since the raucous 2021 full-length album, Comfort to Me. On “U Should Not Be Doing That,” the group — Amy Taylor, Dec Martens, Gus Romer and Bryce Wilson — trade the roaring menace of their previous releases …