Xcode 12.5 in UCB time estimations

[paradizIsCool]

Update on Xcode 12.5 and 13.0 Timing

Hi everyone, Our team is hard at work getting Xcode 12.5 and 13.0 supported for Cloud Build. Our current timeline is to have 12.5 supported by the end of September 2021 and 13.0 shortly after its official release by Apple. Please keep in mind that while this is our best estimate of a delivery date, there are always chances of delay due to the dynamic environment that we deploy our builders into for Mac/iOS target platforms. To learn more (including the latest on which Unity versions support wh…