“ Heartstopper ” is set to say goodbye this summer. The hit Netflix series based on the graphic novels by Alice Oseman will end with a movie, titled “Heartstopper Forever,” which is set to drop on the streamer on July 17. In the film, Kit Connor and Joe Locke reprise their roles as Nick and Charlie as they stand on the cusp of adulthood. With Nick about to head to university and Charlie becoming more confident at school, the main question is whether their relationship will survive becoming long-