This is now the latest stable Xcode release and has some important fixes to Swift Concurrency back-deployment that could be beneficial to us.

• Version: 13.4 (13F17a)
• Release Notes: https://developer.apple.com/documentation/xcode-release-notes/xcode-13_4-release-notes
• Download: https://developer.apple.com/services-account/download?path=/Developer_Tools/Xcode_13.4/Xcode_13.4.xip

Will require EngFlow to update their executors just as was done for #1997

cc @lfpino @Yannic