ci: Use Apple silicon for the default macOS runners

[matthewfeickert]

Description

• Use the 'macos-latest' runs-on option which now defaults to 'macos-14' which are Apple silicon runners.
  • c.f. https://github.com/actions/runner-images/blob/e63a194563cb0bb3bc1493144fe0ef6804249b43/images/macos/macos-14-arm64-Readme.md
• Keep a 'macos-13' runners to continue to test Intel based macOS for the latest Python version.
  • c.f. https://github.com/actions/runner-images/blob/e63a194563cb0bb3bc1493144fe0ef6804249b43/images/macos/macos-13-Readme.md

Updates PR #2468

Checklist Before Requesting Reviewer

• Tests are passing
• "WIP" removed from the title of the pull request
• Selected an Assignee for the PR to be responsible for the log summary

Before Merging

For the PR Assignees:

• Summarize commit messages into a comprehensive review of the PR

* Use the 'macos-latest' runs-on option which now defaults to 'macos-14' which are
  Apple silicon runners.
   - c.f. https://github.com/actions/runner-images/blob/e63a194563cb0bb3bc1493144fe0ef6804249b43/images/macos/macos-14-arm64-Readme.md
* Keep a 'macos-13' runners to continue to test Intel based macOS for the
  latest Python version.
   - c.f. https://github.com/actions/runner-images/blob/e63a194563cb0bb3bc1493144fe0ef6804249b43/images/macos/macos-13-Readme.md
* Updates PR https://github.com/scikit-hep/pyhf/pull/2468

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.21%. Comparing base (8260852) to head (8dc1635).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2471   +/-   ##
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  Coverage   98.21%   98.21%           
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  Files          69       69           
  Lines        4543     4543           
  Branches      804      804           
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  Hits         4462     4462           
  Misses         48       48           
  Partials       33       33           

Flag	Coverage Δ
contrib	97.79% <ø> (ø)
doctest	98.08% <ø> (ø)
unittests-3.10	96.23% <ø> (ø)
unittests-3.11	96.23% <ø> (ø)
unittests-3.12	96.23% <ø> (ø)
unittests-3.8	96.25% <ø> (ø)
unittests-3.9	96.27% <ø> (ø)

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[henryiii]

I think I'd use macos-14 until the migration is complete. On many repos it's still macos-12, I think.

[henryiii]

Though from the time taken it is obviously AS, and probably it will never go back once bumped on a repo.

[matthewfeickert]

I think I'd use macos-14 until the migration is complete. On many repos it's still macos-12, I think.

@henryiii is the rollout repository specific or random assignment? If it is repository based then pyhf has already gotten access

(https://github.com/scikit-hep/pyhf/actions/runs/8843240294/job/24283156332?pr=2471#step:1:8)

Current runner version: '2.315.0'
Operating System
  macOS
  14.4.1
  23E224
Runner Image
  Image: macos-14-arm64
  Version: 20240422.3
  Included Software: https://github.com/actions/runner-images/blob/macos-14-arm64/20240422.3/images/macos/macos-14-arm64-Readme.md
  Image Release: https://github.com/actions/runner-images/releases/tag/macos-14-arm64%2F20240422.3

[henryiii]

I'm pretty sure it's repo specific. Once you bump up, I think it doesn't bump back down.

[matthewfeickert]

I'm going to approve and merge this myself. As always, PRs approved by a single core dev can be reverted as needed by the rest of the dev team.