targets: drop all macOS versions except 14 (Sonoma)

Daniel P. Berrangérequested to merge
berrange/libvirt-ci:macos into master

If you run Cirrus CI macOS jobs using any image except for 'macos-runner:sonoma' it will now ignore your requested image and use this one instead.

This is a recent change made by Cirrus CI to stop allowing a free choice of image.

To some degree using multiple macOS versions was redundant. Most of the dependencies are obtained from HomeBrew, getting the same content regardless of macOS version. The base OS image provides the XCode toolchain, which does impact the app build process.

The Sonoma image contains multiple XCode versions if apps desire to test broader compatibility than the default XCode version.

Signed-off-by: Daniel P. Berrangé berrange@redhat.com

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