Respect generic Protocol in ellipsis removal

[charliermarsh]

Closes #9840.

[Julian]

I don't know what map_subscript does (but if you don't respond before I look :D) -- I'd double check this also works the right way with "new" generics syntax -- i.e. class Foo[T](Protocol)? Probably that worked even before, but just mentioning it.

EDIT: Yeah that looks like it works even on the current release!

Thanks again for the quick fix!

[github-actions]

ruff-ecosystem results

Linter (stable)

ℹ️ ecosystem check encountered linter errors. (no lint changes; 1 project error)

sphinx-doc/sphinx (error)

ruff failed
  Cause: Selection of unstable rules without the `--preview` flag is not allowed. Enable preview or remove selection of:
	- FURB113
	- FURB131
	- FURB132

Linter (preview)

✅ ecosystem check detected no linter changes.

[charliermarsh]

👍 That should already work, but I'll add a test for it too!