Fix deprecated np.float

[howtodowtle]

This minor PR fixes the deprecated use of np.float, which was deprecated in NumPy 1.20.

It changes np.float in get_1d_sincos_pos_embed_from_grid to np.float32 (in line with the usage in get_2d_sincos_pos_embed in the same file).

Without this fix (or switching to an old NumPy) version, building the model (e.g., to load weights) yields the following error:

AttributeError: module 'numpy' has no attribute 'float'.
`np.float` was a deprecated alias for the builtin `float`. To avoid this error in existing code, use `float` by itself. Doing this will not modify any behavior and is safe. If you specifically wanted the numpy scalar type, use `np.float64` here.
The aliases was originally deprecated in NumPy 1.20; for more details and guidance see the original release note at:
    https://numpy.org/devdocs/release/1.20.0-notes.html#deprecations

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[braxtonowens]

Lets move this along.