CLSA-2025-1763031933 libxml2: Fix of 3 CVEs

CVE-2025-9714: additional fixes - CVE-2025-24928: fix stack-based buffer overflow in xmlSnprintfElements in valid.c - CVE-2024-56171: fix use-after-free in xmlSchemaIDCFillNodeTables and xmlSchemaBubbleIDCNodeTables in xmlschemas.c...