bpo-41161 Add news entry for libmpdec-2.5.0 (GH-21243)

diff --git a/Misc/NEWS.d/next/Library/2020-06-30-20-50-51.bpo-41161.QTdJjz.rst b/Misc/NEWS.d/next/Library/2020-06-30-20-50-51.bpo-41161.QTdJjz.rst
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+The decimal module now requires libmpdec-2.5.0. Users of
+--with-system-libmpdec should update their system library.