macOS 11 reports incorrect os.macosx.version.major

The current macOS major version is 11, but facter reports it as 11.2.

Starting with macOS 11, Apple is incrementing the second component of the release number for point releases (e.g., 11.0, 11.1, 11.2). It's assumed that going forward a new major version would be 12, 13, etc.

This is a change from previous releases, where Apple would increment the third digit (e.g., 10.15.1, 10.15.2), and a new major version would be 10.x.

This seems to be occurring here. I expect there will need to be logic to use the first component going forward, and the first two for versions starting with 10.