Test on Apple Silicon ARM64

[cclauss]

Overview: What does this pull request change?

Test on Apple Silicon ARM64

Motivation and Explanation: Why and how do your changes improve the library?

Ensure that our CI tests pass on modern Macs.

• https://github.com/actions/runner-images

The currently available GitHub Actions macOS runners are:

macOS Version	runner.arch
macos-14	ARM64
macos-15	ARM64
macos-15-intel	X64
macos-26	ARM64
macos-latest	ARM64

Links to added or changed documentation pages

Further Information and Comments

Reviewer Checklist

• The PR title is descriptive enough for the changelog, and the PR is labeled correctly
• If applicable: newly added non-private functions and classes have a docstring including a short summary and a PARAMETERS section
• If applicable: newly added functions and classes are tested

[behackl]

I wonder if we should drop testing for macos-15-intel altogether and only use macos-latest -- AFAIR there were some build / linker issues with cairo when @chopan050 tried that recently. Does the combination of macos-latest with Python 3.13 just play nice(r)?

[cclauss]

I think those Cairo issues are more about the macOS cache logic at

manim/.github/workflows/ci.yml

Line 77 in a50d836

key: ${{ runner.os }}-dependencies-cairo-${{ hashFiles('.github/scripts/ci_build_cairo.py') }}

Perhaps it also needs to capture runner.arch so that Intel and ARM caches do not overwrite each other.

[cclauss]

OK! macos-latest passes on 4 Pythons. macos-15-intel running on Py3.13 (because it is Required).