Release: Numpy 2 not being tested

[mikedh]

• numpy 2 wasn't being tested in docker
  • fixes #2237
  • blocked by mysterious build failures in trimesh/vhacdx. This was quite odd and probably related to upstream Windows CI runner shenanigans and eventually worked on a re-build :man_shrugging:
• allow more functions to work with (n, 2) vertices in addition to (n, 3) vertices, including:
  • trimesh.triangles: points_to_barycentric, barycentric_to_points
  • trimesh.path: Path3D.to_planar
• continue work on Trimesh.projected for robustness