[issue46400] Please update bundled libexpat to 2.4.3 with security fixes

[Ned Deily]

Change by Ned Deily <nad at python.org>:


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nosy:  -ned.deily, paul.moore, ronaldoussoren, steve.dower, tim.golden, zach.ware

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46400>
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