Pull request Set iOS deployment target to 9 for Swift >= 5.3 on cx-org/CombineX
Xcode 12 ships with 5.3 but also drops iOS 8 support. This causes a warning ("The iOS Simulator deployment target 'IPHONEOS_DEPLOYMENT_TARGET' is set to 8.0, but the range of supported deployment target versions is 9.0 to 14.2.99.")