Use new Github actions ARM runners for tests

[cdce8p]

https://github.blog/changelog/2025-01-16-linux-arm64-hosted-runners-now-available-for-free-in-public-repositories-public-preview/

[hauntsaninja]

Sweet, looks like it's 1.5x faster cc @JukkaL who will appreciate this :-)

[cdce8p]

Sweet, looks like it's 1.5x faster cc @JukkaL who will appreciate this :-)

Not sure it's ready for us here quite yet. Last I checked there was an issue with the environment variables, which should be fixed soon. This PR works only due to a temporary fix. I'd also like to wait for a new release of actionlint so we don't have to pin the current sha, unless that takes much longer.

Let's see how it looks next week.

Note: The env var issue doesn't effect cibuildwheels which is why we're able to start using the new runner there already.

[github-actions]

According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅

[cdce8p]

Let's see how it looks next week.

Seems we didn't even need that week. It's ready now. The environment variable issue was resolved Friday and actionlint released a new version with the updated runs-on tags today.

There might still be the occasional issue, e.g. I've read that actions/checkout isn't completely fine, but a restart of the job should generally fix it. It will also only improve with time.