[issue40874] Update to libmpdec-2.5.0

[Stefan Krah]

Stefan Krah <stefan at bytereef.org> added the comment:

I was accused of breaking the release, which is false. It is outside
of a release manager's authority to claim that an *experimental* and
*nightly* build that uses a flag in an unintended manner needs counts
as breakage.

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