Qiskit / qiskit / 6350685416

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Fix casting rules changing in Numpy 2 (#10897)

This fixes several places in `quantum_info` that will be affected by the
casting-rule changes coming in Numpy 2.0[^1].  There are several other
places where the casting rules will change the output types of certain
arrays due to the removal of Python-scalar value-dependent casting, but
those do not appear to have an observable effect on our behaviour, so I
have left them.

It is also becoming invalid to set a scalar entry in a Numpy array with
an array-like with a non-zero number of dimensions, even if the sequence
is of length 1.

[^1]: https://numpy.org/neps/nep-0050-scalar-promotion.html

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