Ensure macOS 12 and higher are always in sofa feed, regardless of support status

[erikng]

This might result in disagreements, but I just thought about this while fixing macOS 15 and macadmins/nudge#603

If an admin is using latest-minor and does not care about security, if we pull macOS 12 when macOS 15 comes out, Nudge will stop Nudging.

Ideally, a company should patch, but if they are attempting to get on the last version of macOS 12 while they figure out how to get to macOS 13+, nudge will no longer effectively ensure the company is at least running the last "secure" version.

[headmin]

With the new UI we can easily keep macOS 12

[erikng]

What about the json though?

[headmin]

Closing this issue as we keep macOS 12 in place already.