Apple is accelerating its beta cycle, with a second round of beta releases of iOS 12 and watchOS 5 this week. Yesterday saw the tenth beta of iOS 12, build 16A5364a, which had the unusual addition of being announced to previous iOS 12 users via a pop-up notification, and earlier today Apple rolled out the ninth beta of watchOS 5 (build 16R5360a). Both of these come only four days after Apple released the ninth and eighth betas, respectively, although…