Remove npt typing

Author: Giulero

src/adam/model/mj_factories/mj_joint.py

@@ -1,6 +1,5 @@
 from typing import Dict, List, Optional
 
-import numpy.typing as npt
 from scipy.spatial.transform import Rotation
 
 from adam.core.spatial_math import SpatialMath

src/adam/model/std_factories/std_joint.py

@@ -1,6 +1,5 @@
 from typing import Union
 
-import numpy.typing as npt
 import urdf_parser_py.urdf
 
 from adam.core.spatial_math import SpatialMath