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Backport of #29368.

Fix to use Py_XINCREF instead of Py_INCREF to safely handle the case where op_dtypes[0] is NULL

Root Cause

• When calling string_expandtabs_length_promoter, the first item of op_dtypes can be NULL.

Rationale

• As noted in this comment regarding ops, legacy type resolution does not handle NULL well. Therefore, I changed the logic to use the second item instead.

Outcome

• numpy._core.strings._expandtabs_length.reduce(numpy.zeros(200)) now raises a UFuncTypeError, instead of causing a segmentation fault.

…gth.reduce`

Fixes the first item of numpy#28829. Use `Py_XINCREF` instead of `Py_INCREF` to safely handle the case where `op_dtypes[0]` is NULL

TST: add tests to check numpy._core.strings._expandtabs_length

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