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GitHub has announced that arm64 Linux runners are now free for public repositories - https://github.blog/changelog/2025-01-16-linux-arm64-hosted-runners-now-available-for-free-in-public-repositories-public-preview/
This means that we can use them, rather than QEMU, for the arm64 job, greatly reducing the time taken.
This speed increase means that it is now fast enough to upgrade the Ubuntu arm64 job to 24.04.