MACOSX_DEPLOYMENT_TARGET bump from 10.15 > 12.0 to make builds possible again using Mac Golden Gate 27.0

Today I was trying a new build using Mac Golden Gate 27.0 with the latest Xcode , but it was complaining about the version

.xcodeproj: error: The macOS deployment target 'MACOSX_DEPLOYMENT_TARGET' is set to 10.15, but the range of supported deployment target versions is 12.0 to 27.0.x. (in target 'liblove-macosx' from project 'liblove') ** ARCHIVE FAILED **

It did run when I change it by hand for now.

old: MACOSX_DEPLOYMENT_TARGET = 10.15; needed for Golden Gate 27.0: MACOSX_DEPLOYMENT_TARGET = 12.0;

https://github.com/love2d/love/blob/a0ea2596798c3517d9117a98dc02871a11ed88cd/platform/xcode/love.xcodeproj/project.pbxproj#L584 https://github.com/love2d/love/blob/a0ea2596798c3517d9117a98dc02871a11ed88cd/platform/xcode/love.xcodeproj/project.pbxproj#L660 https://github.com/love2d/love/blob/a0ea2596798c3517d9117a98dc02871a11ed88cd/platform/xcode/love.xcodeproj/project.pbxproj#L894

https://github.com/love2d/love-apple-dependencies/blob/a5522634f1e581a1ebab73bf3ab4bd7a853b7a3e/macOS/luajit-macOS.sh#L10 https://github.com/love2d/love-apple-dependencies/blob/a5522634f1e581a1ebab73bf3ab4bd7a853b7a3e/iOS/luajit-iOS.sh#L10