Sydney Sweeney is seemingly saying goodbye to Euphoria season 3 much like her on-screen character, Cassie Howard — with a bang. “It’s called… acting,” Sweeney, 28, wrote via Instagram on Sunday, May 31, alongside several behind-the-scenes and on-screen photos of the actress during what many believe to be the final season of the hit HBO series. In one nearly-total nude photo, the actress can be seen posing with what fans will immediately recogniz…