Restore pybind11 2.9.0.

[jpivarski]

No description provided.

[codecov]

Codecov Report

Merging #1223 (be5261d) into main (0a0e9be) will decrease coverage by 1.21%.
The diff coverage is 73.83%.

Impacted Files	Coverage Δ
src/awkward/_v2/contents/emptyarray.py	69.54% <ø> (ø)
src/awkward/_v2/contents/content.py	81.74% <23.07%> (-1.45%)	⬇️
src/awkward/_v2/_typetracer.py	68.94% <33.33%> (-0.25%)	⬇️
src/awkward/_v2/_slicing.py	83.79% <75.47%> (-2.48%)	⬇️
src/awkward/_v2/contents/regulararray.py	82.66% <80.00%> (+0.07%)	⬆️
src/awkward/_v2/operations/structure/ak_ravel.py	91.66% <87.50%> (+11.66%)	⬆️
src/awkward/_v2/contents/unionarray.py	83.59% <95.45%> (+0.19%)	⬆️
...awkward/_v2/operations/structure/ak_local_index.py	100.00% <100.00%> (+20.00%)	⬆️
src/awkward/_v2/tmp_for_testing.py	5.31% <0.00%> (-77.78%)	⬇️
src/awkward/_v2/contents/bitmaskedarray.py	64.45% <0.00%> (-0.79%)	⬇️
... and 13 more