Bump pybind11 to 2.10.0 and build SMTK w/ c++17.

Open David Thompson requested to merge dcthomp/cmb-superbuild:pybind-bump into master

The pybind11 update from 2.9.1 to 2.10.0 fixes an issue that prevented compilers (gcc and clang at a minimum) from building in c++17-compliant mode. Now that it is fixed, SMTK can begin using c++-17 features.

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