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Fix mypy errors from numba 0.67 type stubs (#854)

numba 0.67.0 ships py.typed and stub files. from_dtype is now typed as
overloads over np.dtype[ScalarT] | type[ScalarT] for concrete scalar
types, so passing npt.DTypeLike (which includes str, list, _DTypeDict,
...) matches no overload and mypy fails with four arg-type errors.

Normalise with np.dtype() before calling from_dtype, and hoist the
conversions out of the argument list. This keeps the public DTypeLike
signature, and additionally makes string dtypes work at runtime, which
previously raised NumbaNotImplementedError despite being valid
DTypeLike.

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

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