Correct wrong return type hint in ASE calculator

python/metatensor-torch/metatensor/torch/atomistic/ase_calculator.py

@@ -238,7 +238,7 @@ def calculate(
  atoms: ase.Atoms,
  properties: List[str],
  system_changes: List[str],
- ) -> Dict[str, np.ndarray]:
+ ) -> None:
  """
  Compute some ``properties`` with this calculator, and return them in the format
  expected by ASE.