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

[STINNER Victor]

STINNER Victor added the comment:

> #82  CVE-2017-11742 -- Windows: Fix DLL hijacking vulnerability using Steve Holme's LoadLibrary wrapper for/of cURL

https://github.com/libexpat/libexpat/issues/82

I don't think that this bug affects Python since Python sets a hash secret.

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