chore: Lower pybind11 test dependency

[LecrisUT]

Fedora does not have pybind11 2.12 yet, lowering the dependency a bit.

But regarding the bounding of the minimum, is the github CI testing both for minimum and latest? I only see this part, which doesn't rely on pyproject.toml

scikit-build-core/.github/workflows/ci.yml

Lines 136 to 137 in c8be08c

	- name: Min requirements
	run: pip install --constraint tests/constraints.txt .[test] ninja

Are there plans to automate that and use the versions from pyproject.toml?

As for distro testing, the test bounds are meaningless there since they are only used at build time, and it always picks up the distro packaged versions.

[henryiii]

Yes, constraints.txt is removed in #679.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.30%. Comparing base (c8be08c) to head (61ea3fe).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #691   +/-   ##
=======================================
  Coverage   86.30%   86.30%           
=======================================
  Files          64       64           
  Lines        3315     3315           
=======================================
  Hits         2861     2861           
  Misses        454      454           

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