fix: use reshape instead of raw shape assignment for numpy arrays

[Trenza1ore]

NumPy 2.5.0 deprecated assignment to shape attribute: numpy/numpy#29536

np.reshape(...) and np.ndarray.reshape(...) did not support copy=False until numpy>=2.1, therefore for compatibility's sake, I decided to just use np.reshape(shape).

This should be equivalent to the default copy=None in numpy>=2.1:

If None, a copy will only be made if it’s required by order.

Closes #540

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