Add pybind11-stubgen dependency to conda build.

Author: 0mdc

conda-build/habitat-sim/meta.yaml

@@ -28,6 +28,7 @@ requirements:
     - {{ cdt('libpng-devel') }} # [linux]
     - {{ cdt('xorg-x11-proto-devel') }}  # [linux]
     - {{ cdt('libxxf86vm-devel') }}      # [linux]
+    - pybind11-stubgen
 
   host:
     - python x.x