Got this in an email from Apple Developer Relations late last night:
ITMS-90725: SDK version issue - This app was built with the iOS 16.2 SDK. Starting April 29, 2024, all iOS and iPadOS apps must be built with the iOS 17 SDK or later, included in Xcode 15 or later, in order to be uploaded to App Store Connect or submitted for distribution.
So it’s going to become a blocker in a couple months. Would be good to be able to test it out sooner, since functionality does often change based on which xcode version you use to build.
This is a much longer delay than for the past two years, which were both supported by travis in about a month, but this time it’s been 5 months.