Numpy DeprecationWarning to address #1027

 /Users/bpedigo/JHU_code/graspologic/graspologic/graspologic/nominate/spectralVN.py:226: DeprecationWarning: `np.int` is a deprecated alias for the builtin `int`. To silence this warning, use `int` by itself. Doing this will not modify any behavior and is safe. When replacing `np.int`, you may wish to use e.g. `np.int64` or `np.int32` to specify the precision. If you wish to review your current use, check the release note link for additional information.
  Deprecated in NumPy 1.20; for more details and guidance: https://numpy.org/devdocs/release/1.20.0-notes.html#deprecations
    y_vec = self.embedding_[y_checked.astype(np.int)]  # type: ignore