GitHub Actions: Replace deprecated macos-12 with macos-13

[hugovk]

macOS12 runner image
We are beginning the deprecation process for the macOS 12 runner image, which allows us to balance our fleet capacity ahead of our upcoming macOS 15 launch. This image will be fully retired by the December 3rd, 2024. We recommend updating workflows to use macos-14, macos-13, or macos-latest.

https://github.blog/changelog/2024-08-19-notice-of-upcoming-deprecations-and-breaking-changes-in-github-actions-runners/

• macos-12 and macos-13 are Intel
• macos-14 is M1 and the same as macos-latest (although macos-15 will become macos-latest in the near future)

We currently test macos-12 (Intel) and macos-latest (M1), so replace macos-12 with macos-13 to retain Intel + M1 testing.

[ichard26]

I planned to address this at some point, but then completely forgot. Thanks! :)

[freakboy3742]

macOS-12 builds are now taking over 3 hours, because homebrew support has been dropped, so the first step in the build involves compiling llvm and rust from scratch. The following message appears in the build logs:

Run DEPS=breezy
/usr/local/bin/svn
Warning: You are using macOS 12.
We (and Apple) do not provide support for this old version.
It is expected behaviour that some formulae will fail to build in this old version.
It is expected behaviour that Homebrew will be buggy and slow.
Do not create any issues about this on Homebrew's GitHub repositories.
Do not create any issues even if you think this message is unrelated.
Any opened issues will be immediately closed without response.
Do not ask for help from Homebrew or its maintainers on social media.
You may ask for help in Homebrew's discussions but are unlikely to receive a response.
Try to figure out the problem yourself and submit a fix as a pull request.
We will review it but may or may not accept it.

[freakboy3742]

@hugovk FYI the test failure you're seeing here is corrected by #12964.

[uranusjr]

Pending CI

[hugovk]

And CI is green :)