Qt5 and 6 deployment target

[Mark E Anderson]

According to this bug and comment: https://bugreports.qt.io/browse/QTBUG-128900?focusedId=823817&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-823817

The deployment target that Qt5/6 shoots for is macOS 12 - perhaps that's what we should standardize on for all macOS > 12 builds.

What do people think?

—Mark
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