GH-43069: [Python] Use Py_IsFinalizing from pythoncapi_compat.h #43767
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Rationale for this change
#43540 already vendored
pythoncapi_compat.h
, so closing #43069 by using this as well forPy_IsFinalizing
(which was added in #42034, and for which we opened that follow-up issue to usepythoncapi_compat.h
instead)