Add possibility to modify the macOS minimum version

[prof18]

Hi all 👋

I recently tried to publish my macOS app to the App Store and the publishing failed because I wasn't including an Intel version

The alternative could be publishing a Universal binary, but it's not quite supported now (see #1599). But by setting the minimum version of macOS to 12, it's possible to upload only arm version.

So, I've added the possibility of changing the minimum macOS version.