[issue40874] Update to libmpdec-2.5.0

[Anthony Sottile]

Anthony Sottile <asottile at umich.edu> added the comment:

especially this late in the beta period for 3.9 -- it would be unfortunate for 3.10 but it's an explicit break of feature freeze for 3.9

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<https://bugs.python.org/issue40874>
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