Fix MacOSWindow.isAlive on recent macOS

[AuroraWright]

I'm not sure since when, but at least on Ventura 13.6.3 "tell window winName to set prevIndex to index" causes the try block to exit, causing isDone to be left to False. Just having a "tell window" seems to be enough here. On a side note, raiseWindow and lowerWindow are also broken since setting "index" doesn't seem to work anymore, but I have no idea how to fix it. isAlive being False causes issues in general so I think this should be fixed at least

[Kalmat]

If you are just curious, this seems to work in modern versions (perform action "AXRaise" of window winName is the ky here!!):

def raiseWindow(self):
    """
    Raises the window to top so that it is not obscured by any sibling windows.

    :return: ''True'' if window raised
    """
    if not self._winTitle:
        return False

    cmd = """on run {arg1, arg2}
                set appName to arg1 as string
                set winName to arg2 as string
                try
                    activate application appName
                    tell application "System Events" to tell process appName
                        perform action "AXRaise" of window winName
                    end tell
                end try
           end run"""
    proc = subprocess.Popen(['osascript', '-', self._appName, self._winTitle],
                            stdin=subprocess.PIPE, stdout=subprocess.PIPE, encoding='utf8')
    ret, err = proc.communicate(cmd)
    return not err