[issue40874] Update to libmpdec-2.5.0

[Anthony Sottile]

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

I package pythons for ubuntu:

https://github.com/deadsnakes/python3.9-nightly/actions/runs/151286686
https://github.com/deadsnakes/python3.10-nightly/actions/runs/151287821

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