[issue46400] Please update bundled libexpat to 2.4.4 with security fixes (CVE-2021-45960)

[Dong-hee Na]

Change by Dong-hee Na <donghee.na at python.org>:


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nosy: +corona10
nosy_count: 4.0 -> 5.0
pull_requests: +29455
pull_request: https://github.com/python/cpython/pull/31296

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<https://bugs.python.org/issue46400>
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