Rebecca Rubin Film and Media Reporter“Fantastic Beasts: The Secrets of Dumbledore” welcomed a boost in ticket sales at the international box office, though the third installment in the “Harry Potter” spinoff series already seems to be running out of steam.Over the weekend, “Fantastic Beasts 3” added $71.7 million from 66 foreign markets, taking the film’s international tally to $150.4 million. After debuting to a less-than-enchanting $43 million in North America, “The Secrets of Dumbledore” has collected $193.4 million to date.Along with United States and Canada, the Warner Bros.