Use np.int64 type for day to nanosecond conversion (NEP50) #922
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Fixes #921.
Fixes #923 (after release)
Required due to a change in numpy's type promotion with numpy >= 2:
https://numpy.org/devdocs/numpy_2_0_migration_guide.html#changes-to-numpy-data-type-promotion
NEP 50 -- Promotion rules for Python scalars
The
DAYS_TO_MILLIS
constant actually contained the number of nanoseconds in a day, so I renamed it. I hope this is not incorrectly used outside of fastparquet. At least it is not part of the API documentation.