Bump target version for x64 app template to allow to pass gatekeeper/notarization

[k-dominik]

With the current configuration in the app template, it is impossible to make an app pass gatekeeper - it requires minium sdk version of 10.9.

I've confirmed that changing

https://github.com/ronaldoussoren/py2app/blob/487a55e34746fa6eb857de51f2bd0ac03026592d/src/py2app/apptemplate/setup.py#L23-L24

to

 "target": "10.9", 
 "cflags": "-g -arch x86_64", 

and rebuilding the binaries does the trick.

Would you care for a PR, @ronaldoussoren?

[radarhere]

You aren't suggesting that " -Wl,-rpath,@executable_path/../Frameworks" should be removed as well, right?

[k-dominik]

the universal and arm-64 variant seem to do without, so, yes.