CI, MAINT: known CI issue with NumPy main/latest

[tylerjereddy]

Example failure: https://github.com/scipy/scipy/actions/runs/6555137521/job/17803175138?pr=19402

Suspected/related issues:

• MAINT: NumPy normalize_axis_tuple data-apis/array-api-compat#63
• and if you add that patch in, then several failures that seem pybind11-related, though I'm not 100 % sure on my diagnosis: MAINT: NumPy _ARRAY_API import deprecation warning pybind/pybind11#4886 (update: need a new stable release for that fix, works with their master branch)

[ngoldbaum]

In the CI log it looks like pybind11 is getting installed from the last pip release in July which doesn't have the fix for this. I bet installing pybind11 from the git repo will fix this.

[tylerjereddy]

Ok, that fixes most of the issues, I still get the same failure with matplotlib/tri/_triangulation.py:124: in get_cpp_triangulation doing the same thing, so maybe whatever that is needs to get rebuilt with latest pybind11 branch as well.

Anyway, sounds like the ecosystem has branches with fixes, but probably makes sense to keep this issue/reminder open for now.

[tylerjereddy]

I think we're all green now after gh-19426