fix: don't use windows-xl runners, too expensive

[ry]

No description provided.

[lino-levan]

LGTM

[iuioiua]

Should the same be done with the ubuntu-20.04-xl runner?

[lino-levan]

@iuioiua pricing for runners varies immensely depending on the OS, linux in general is the cheapest option so this is probably reasonably limited to windows-xl

ref: https://docs.github.com/en/billing/managing-billing-for-github-actions/about-billing-for-github-actions#per-minute-rates

[iuioiua]

True. However, seeing as nothing particularly intensive is going on in the repo, ubuntu-20.04-xl may not be needed.

[kt3k]

LGTM

The execution time is still not that bad (4m & 6m)