python3Packages.pykdl: use system pybind11
pykdl 1.5.1 only supports using a vendored copy of pybind11, but this
version doesn't support Python 3.11. Therefore, backport an upstream
patch that allows using a system pybind11 installation.
(cherry picked from commit 20135addf0c43bbf2efd74104439df1b02479dd9)
authored by Ben Wolsieffer and committed by github-actions[bot] c1dede98 d572fb05