Switch to GitHub Actions public ubuntu-24.04-arm
runner
#321
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GitHub recently announced ARM support when using their public runners:
https://github.blog/changelog/2025-01-16-linux-arm64-hosted-runners-now-available-for-free-in-public-repositories-public-preview/
This means we don't need to use the custom runner group for ARM CI jobs any more, which have a slower boot time, since they don't have a warm slack pool of machines.
For example the CI run in #320 has been waiting for 11 mins for a runner to be available:
GUS-W-17659818.