GitHub Actions macOS-10.15 image deprecation

[aeiouaeiouaeiouaeiouaeiouaeiou]

https://github.com/actions/virtual-environments/issues/5583

 > GitHub Actions is starting the deprecation process for macOS 10.15. 
While the image is being deprecated, You may experience longer queue 
times during peak usage hours. Deprecation will begin on 5/31/2022 and 
the image will be fully unsupported by 8/30/2022

They also made the Monterey image available to all users, but I cannot 
test it due to the lack of the necessary CI files 
(https://github.com/macports/macports-ci-files/releases/tag/v2.7.2).
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