Cynthia Erivo is ready to talk about anything other than Wicked . The 39-year-old British star spent the last two years on a whirlwind press tour for her Oscar-nominated role as Elphaba in Jon M. Chu’s Wicked and Wicked: For Good , opposite Ariana Grande as Glinda, and is ready to — respectfully — move forward. Sitting down for a recent episode of Variety ’s YouTube series “Know Their Lines,” in which actors are tested to see if they remember their lines from past projects, Erivo was handed a card asking her to perform her iconic “Defying Gravity” riff . “No,” she said curtly, handing the card back.…