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per https://docs.github.com/en/actions/using-github-hosted-runners/using-github-hosted-runners/about-github-hosted-runners#standard-github-hosted-runners-for-public-repositories the oldest support macos version is nowadays 13,
so use it instead of no longer available v12.
In addition, bump the golang version on macos to a more respectable 1.21 instead of ancient 1.18
(see also: #397)