Ghibli, the Japanese studio that just won its second Oscar for Best Feature Animation for The Boy and The Heron, hasn’t announced what it plans next. However, founder Hayao Miyazaki, who at 83 was the oldest director ever nominated in that category, won’t rule out making another film, even if his next project is a short instead of a full-length feature. According to a longtime confidante, Miyazaki, one of animation’s most admired and successful directors, is a bit embarrassed about having pronounced a decade ago that he would no longer make movies, citing his age. “He regrets having announced …