[issue30947] Update embeded copy of libexpat from 2.2.1 to 2.2.3

[STINNER Victor]

STINNER Victor added the comment:


New changeset ec4ab09b7c0b5070bdb27351f979cbecc4636245 by Victor Stinner in branch '2.7':
bpo-30947: Update libexpat from 2.2.1 to 2.2.3 (#3106) (#3145)
https://github.com/python/cpython/commit/ec4ab09b7c0b5070bdb27351f979cbecc4636245


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