fix: numpy>2 casting of ints

[fkroeber]

Implements #260, solution proposed by @fgassert

[fgassert]

FYI there are two other spots that might need a similar treatment:

stackstac/stackstac/prepare.py

Line 167 in 3857190

if not np.can_cast(type(asset_scale), dtype):

[fkroeber]

Thanks for pointing me to it @fgassert!

I have realised that the implementation requires further consideration. I am therefore moving the discussion back to the issues, closing the PR for now.