Zscaler (ZS) stock fell Friday after the cybersecurity firm reported fiscal fourth-quarter earnings and revenue that topped estimates while its fiscal 2027 outlook for a key financial metric underwhelmed. Reported after the market close on Thursday, Zscaler earnings rose 22% to $1.19 per share on an adjusted basis. Revenue climbed 25% to $898.2 million, the San Jose, Calif.-based firm said.…