[3.10] gh-149017: Upgrade bundled Expat to 2.8.0 (#149020)#149075

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StanFromIreland wants to merge 3 commits intopython:3.10from

StanFromIreland:backport-005555a-3.10

Commits on Apr 27, 2026

gh-149017: Upgrade bundled Expat to 2.8.0 (#149020)
StanFromIreland
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Move 'em undefs after `#include <pyconfig.h>` after all
StanFromIreland
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IDK Windows things, but this seems to be where they are defined...?!
StanFromIreland
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