MacOS Monterey build 21C5031d

macOS Monterey build 21C5031d is the official Beta 2 release of macOS Monterey 12.1, which was released to Apple developers on 9 November 2021, then to public beta testers the next day. It includes the ability to use the Hide My Email feature available to iCloud+ subscribers on the Mail app. This build reverts the RDRAND requirement from the previous build.