SCWindow requires macOS >= 13.1 because of isActive

[Brendonovich]

While ScreenCaptureKit is available on >= 12.3, some APIs like isActive are only available on newer versions.
I'm still on macOS 12.5 and am unable to use SCWindow since it requires checking isActive, which causes a crash since the properly cannot be found.
I assume the solution would be to either raise the minimum macOS version requirement, conditionally expose the property depending on minimum macOS version of the crate this is being used in, or default to false for older macOS versions.