during mac code signing, we are using notarytool which only works with xcode 13+.
the pinned version of xcode 14 was removed from Linux mac_android_aot_engine in https://github.com/flutter/engine/pull/41181/files.
This would cause Linux mac_android_aot_engine to fail on post submit by pulling in xcode12.