RFR: 2391: Update .github/workflows/ci.yml

Wed Oct 16 22:50:05 UTC 2024

On Wed, 16 Oct 2024 22:01:27 GMT, Zhao Song <zsong at openjdk.org> wrote:

> Today I received an email from Github and in the email, GitHub says they are going to remove macOS 12 runner image soon.
> We should update our configuration since we are using macOS 12 runner right now.

Marked as reviewed by erikj (Lead).

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PR Review: https://git.openjdk.org/skara/pull/1691#pullrequestreview-2373814764