Use the hosted Linux (and Windows?) arm64 runners when available

[carlosperate]

Based on this blog post, by the end of the year GH will start providing Linux and Windows arm64 runners to open source projects:

• https://github.blog/2024-06-03-arm64-on-github-actions-powering-faster-more-efficient-build-systems/

Once those are released we can move from using a self-hosted Linux arm64 runner to these hosted runners.

[carlosperate]

Originally only available for GitHub Team and Enterprise Cloud plans.
In September they were "generally available" (https://github.blog/changelog/2024-09-03-github-actions-arm64-linux-and-windows-runners-are-now-generally-available/) but it looks like these are still paid runners, not yet offered to open source projects.
Windows nor Linux Arm runners are not present in the docs either:

• https://docs.github.com/en/actions/using-github-hosted-runners/using-github-hosted-runners/about-github-hosted-runners#supported-runners-and-hardware-resources
• https://github.com/actions/runner-images?tab=readme-ov-file#available-images

[carlosperate]

General availability of the Ubuntu Arm runners announced a couple of weeks ago: https://github.blog/changelog/2025-01-16-linux-arm64-hosted-runners-now-available-for-free-in-public-repositories-public-preview/

Implemented in 469aef6.

No news for Windows on Arm yet:

• Availability Windows ARM for open source / personal accounts? actions/partner-runner-images#41
• Windows ARM64 image is missing Microsoft Visual C++ actions/partner-runner-images#19 (comment)