ci(linux): use public ARM64 Linux runners #4156
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Continuation of #4154.
After reading https://rust-lang.zulipchat.com/#narrow/stream/242791-t-infra/topic/Free.20Linux.20ARM64.20runners.20on.20GHA.20now.20in.20beta, it looks like our upstream (https://github.com/rust-lang/rust) has some issues WRT the new runner's virtual environment.
However, this shouldn't affect us in theory because we don't use that environment :)
Update: The new runners are blazingly ⚡ fast! They can complete the full test suite within 6 minutes where it usually will take our ARM64 Mac runners ~12 minutes to finish.