TASK: update versions of actions and runners in CI

[mattip]

I got a notice about macos-12:

The macOS 12 runner image will be removed by December 3rd, 2024. To raise awareness of the upcoming removal, jobs using macOS 12 will temporarily fail during scheduled time periods defined below:
November 4, 9:00 AM - 7:00 PM EST
November 11, 9:00 AM - 7:00 PM EST
November 18, 9:00 AM - 7:00 PM EST
November 25, 9:00 AM - 7:00 PM EST

What you need to do

Jobs using the macos-12 YAML workflow label should be updated to macos-15, macos-14, macos-13, or macos-latest.

Probably a good opportunity to refresh the action versions as well, if they need updating.