Add Windows arm Github runners

[mcbarton]

Description

Please include a summary of changes, motivation and context for this PR.

According to https://github.blog/changelog/2025-04-14-windows-arm64-hosted-runners-now-available-in-public-preview/ Windows arm Github runners are now available for free for public repositories. Therefore I have added them to our ci. Hopefully they pass the same tests as Windows x86, but won't know until the workflow runs. I've put in a PR to add a Windows arm Github job to xeus-cpp too here compiler-research/xeus-cpp#287 .

Fixes # (issue)

Type of change

Please tick all options which are relevant.

• Bug fix
• New feature
• Requires documentation updates

Testing

Please describe the test(s) that you added and ran to verify your changes.

Checklist

• I have read the contribution guide recently

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.93%. Comparing base (96045bd) to head (303de1f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #562   +/-   ##
=======================================
  Coverage   75.93%   75.93%           
=======================================
  Files           9        9           
  Lines        3644     3644           
=======================================
  Hits         2767     2767           
  Misses        877      877           

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[vgvassilev]

Lgtm!