BUG: Fix SystemError when pickling datetime64 array with pickle5 #12844
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Backport of #12748.
Check for error when calling the PickleBuffer constructor in
ndarray.__reduce_ex__
,and fall back on the regular
__reduce__
implementation for arrays which don'tsupport taking a buffer.
Also fix some reference leaks.
Fixes gh-12745, gh-12793
Fixes gh-12745
Fix reference and error handling
Add a test for the fixed reference leak
Fix for PyPy + simplify #if condition
Fix comment