ci: Add Apple silicon macOS to CI

[matthewfeickert]

Description

• Add Apple M1 runner to tests using 'macos-14' for the 'runs-on' key.
  • c.f. https://github.blog/changelog/2024-01-30-github-actions-introducing-the-new-m1-macos-runner-available-to-open-source/
• Lower the tolerance for tests/test_calculator.py to reach agreement between amd64 and arm64.
• Skip doctest evaluation for arm64. While it is possible to go through and revise the precision in the docs examples to be lower so that the # doctest: +NUMBER doctest option could be used, it isn't necesssarily worth it at the moment to add this.

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

* Add Apple M1 runner to tests using 'macos-14' for the 'runs-on' key.
   - c.f. https://github.blog/changelog/2024-01-30-github-actions-introducing-the-new-m1-macos-runner-available-to-open-source/
* Lower the tolerance for tests/test_calculator.py to reach agreement
  between amd64 and arm64.
* Skip doctest evaluation for arm64.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.28%. Comparing base (af5d952) to head (f6d64c5).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2447   +/-   ##
=======================================
  Coverage   98.28%   98.28%           
=======================================
  Files          69       69           
  Lines        4539     4539           
  Branches      803      803           
=======================================
  Hits         4461     4461           
  Misses         45       45           
  Partials       33       33           

Flag	Coverage Δ
contrib	97.86% <ø> (ø)
doctest	98.14% <ø> (ø)
unittests-3.10	96.29% <ø> (ø)
unittests-3.11	96.29% <ø> (ø)
unittests-3.8	96.32% <ø> (ø)
unittests-3.9	96.34% <ø> (ø)

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[matthewfeickert]

wow. The whole macos-14 job runs in under 5 minutes. That's fast!