“I’d love to play an alien,” the actress Haley Lu Richardson tells me over a Zoom call when I ask her what kind of role she’d like to tackle next. While it’s unclear whether she means the cyborg-headed, drooling kind that dry heaves into Sigourney Weaver’s ear or one more akin to the kitschy, operatic belter in The Fifth Element, one thing’s for certain: she’s done playing teenagers (well, maybe just one more).