update GHA

[IndrajeetPatil]

• also test on windows-devel ({styler} changes unicode characters on Windows #847)
• delete empty workflow file

[github-actions]

This is how benchmark results would change (along with a 95% confidence interval in relative change) if fb55784 is merged into master:

•   :ballot_box_with_check:cache_applying: 33ms -> 33ms [-3.61%, +3.46%]
• ❗🐌cache_recording: 1.5s -> 1.52s [+0.25%, +3.59%]
•   :ballot_box_with_check:without_cache: 3.97s -> 4s [-1.16%, +2.44%]

Further explanation regarding interpretation and methodology can be found in the documentation.

[lorenzwalthert]

Thanks. If you want, you can add a news entry. Otherwise, I’ll merge it.

[IndrajeetPatil]

Since this is not a user-facing change, I think it's better not to clutter NEWS with it.