Update __array__ signatures with copy

[Illviljan]

Align all __array__-methods according to the new signature.
mypy can raise very hard to read errors if these are not correct, see #9237 for an example.

References:

• https://numpy.org/doc/stable/user/basics.interoperability.html#dunder-array-interface
• https://github.com/numpy/numpy/blob/d031cac46a17dca63cd2dc3bb147d0d3fceaefe0/numpy/__init__.pyi#L1861-L1868

[keewis]

can you also remove the warning ignore in pyproject.toml, please?

[dcherian]

Thanks for taking this on!