Bugfix: Add libatomic for armv7 compatibility

[stumpylog]

Proposed change

The ARMv7 wheel built by piwheels differs somehow from the official amd64 and aarch64, in that it needs libatomic installed. So install it in the image (for all arches).

I also took the opportunity to group up things in the packages.

Fixes #2052

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other (please explain)

Checklist:

• I have read & agree with the contributing guidelines.
• If applicable, I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• If applicable, I have checked that all tests pass, see documentation.
• I have run all pre-commit hooks, see documentation.
• I have made corresponding changes to the documentation as needed.
• I have checked my modifications for any breaking changes.

[shamoon]

Your dark arts ci skills are the best, thank you.

Wonder if we should release a minor version fix soon with this?

[stumpylog]

I took the easy way this time and just installed the library instead of figuring out what piwheels is doing wrong.

Not sure why it isn't more prevalent. Perhaps most people are on aarch64 with their Pis now. But yes, should probably get a few more fixes in and release a .1

[github-actions]

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