stuck her foot in her mouth with her comments about tennis legends Venus and Serena Williams at the Critics’ Choice Awards March 13 — but insiders told The Post she’ll still win an Oscar on Sunday because the Academy of Motion Pictures Art and Sciences is determined to give the award to a woman.“If the director of ‘CODA’ had been nominated, Jane might be in trouble,” said one Oscars voter of female director Sian Heder. “But Sian wasn’t, so Campion’s fine.”Echoed a second voter: “Not giving it to the only woman out of five directors would be a much bigger non-PC statement.”During her acceptance speech for Best Director at Critics’ Choice, Campion noted her admiration for the Williams sisters — who are the subject and producers of the much-nominated “King Richard” — but said that, unlike in their tennis careers, she has had to compete against men.