[Neuroimaging] Nibabel API change - always read as float

[Michael Waskom]

Also, I feel like if I were writing Python code to operate on a label
image, or when I really wanted integer typed data for efficiency reasons, I
would write `data = img.get_data(dtype=int16)` even if the default were
None, because it would make my intentions/expectations clear. But maybe
others feel differently.
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