ci: use arm runners for aarch64

[jmoralez]

Switches to the github hosted runners with arm64 for the aarch64 jobs to remove emulation.

[codspeed-hq]

CodSpeed Performance Report

Merging #980 will not alter performance

_{Comparing arm-runners (6b354ed) with main (52a5c9a)}

Summary

✅ 6 untouched benchmarks

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