[issue31170] Update to expat 2.2.4 (expat: utf8_toUtf8 cannot properly handle exhausting buffer)

[STINNER Victor]

STINNER Victor added the comment:


New changeset e6d9fcbb8d0c325e57df08ae8781aafedb71eca2 by Victor Stinner in branch 'master':
bpo-31170: Write unit test for Expat 2.2.4 UTF-8 bug (#3570)
https://github.com/python/cpython/commit/e6d9fcbb8d0c325e57df08ae8781aafedb71eca2


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