This week's updated stacks are ready, tests passed, the change diffs can be found at: https://github.com/bitrise-io/bitrise.io/pull/111
Ready for tomorrow's deploy.
Note: Xcode Edge could not be rebuilt, because the latest CocoaPods version is not compatible with the latest Ruby version (2.4.0), which was released a couple of days ago. Next week we'll find a solution for this, for now the Edge stack got the same update as the other macOS stacks (cocoapods spec/cache update, and brew spec/cache update).
Related CocoaPods GitHub issue: https://github.com/CocoaPods/CocoaPods/issues/6299