chore(XML): upgrade bundled libexpat to 2.7.5#5256
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Fixes CVE-2026-32776 (NULL function pointer dereference for empty external parameter entities), CVE-2026-32777 (infinite loop in entityValueProcessor), and CVE-2026-32778 (NULL dereference in setContext on retry after OOM). Closes #5255
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Summary
Closes #5255