[MISC] Add dependency version upper-bound 'tetgen< 0.7.0'. (#2029)

Author: YilingQiao

pyproject.toml

@@ -36,7 +36,7 @@ dependencies = [
     # Used for parsing `.glb` mesh files
     "pygltflib==1.16.0",
     # Use by `PBD3DEntity.sample` to tetrahedralize a mesh
-    "tetgen>=0.6.4; platform_machine!='aarch64'",
+    "tetgen>=0.6.4,<0.7.0; platform_machine!='aarch64'",
     # Used for some advanced mesh processing such as `skeletonization`
     "PyGEL3D",
     # Used to convert VTK output to numpy when converting volume to particles for PBS