[chore] Use public Linux ARM64 runners

[Kielek]

Towards open-telemetry/community#2564

Handles https://github.blog/changelog/2025-01-16-linux-arm64-hosted-runners-now-available-for-free-in-public-repositories-public-preview/

Changes

Switches ARM64 runners to the public version.

Notes

Already done in .NET, .NET Auto and rust. It will allow to remove private runners from otel org and execute whole pipeline on public forks.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.8%. Comparing base (c08d161) to head (763d89a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #6320     +/-   ##
=======================================
- Coverage   81.8%   81.8%   -0.1%     
=======================================
  Files        283     283             
  Lines      24892   24892             
=======================================
- Hits       20380   20378      -2     
- Misses      4108    4110      +2     
  Partials     404     404             

see 2 files with indirect coverage changes

[pellared]

Can you please update the Compatibility matrix in README.md? Simply change Linux to Ubuntu in appropriate places.

[Kielek]

Can you please update the Compatibility matrix in README.md? Simply change Linux to Ubuntu in appropriate places.

Done.
Historically, it was also Ubuntu, no changes here.

[pellared]

Historically, it was also Ubuntu, no changes here.

We know but we were unsure if it would remain to be Ubuntu 😉

Thanks for your contribution.