Updated test.sh to select Xcode 16.1 if the /Applications/Xcode_16.1.app directory exists, otherwise defaults to Xcode 15.3 (picked to match FTL https://github.com/firebase/quickstart-ios/pull/1651); if neither are available, CI will fail. The default iPhone simulator version is selected to match Xcode.
Updated
test.shto select Xcode 16.1 if the/Applications/Xcode_16.1.appdirectory exists, otherwise defaults to Xcode 15.3 (picked to match FTL https://github.com/firebase/quickstart-ios/pull/1651); if neither are available, CI will fail. The default iPhone simulator version is selected to match Xcode.