GitHub Actions runner breaking changes announced

[mk-mxp]

To whom it may concern,

GitHub announced breaking changes to their runner fleet in this post: Notice of upcoming deprecations and breaking changes in GitHub Actions runners - GitHub Changelog

Summary:

• Deprecation of macos-12, upgrade MacOS runners to macos-14
• No more arm64 Ubuntu images, use Arm-supplied images
• People using upload-artifact actions should check, that they don’t rely on auto-inclusion of hidden files / folders