textproc/libxml2: update to 2.10.3 security release (+)

• [CVE-2022-40304] Fix dict corruption caused by entity reference cycles
• [CVE-2022-40303] Fix integer overflows with XML_PARSE_HUGE
• Fix overflow check in SAX2.c

Changelog: https://gitlab.gnome.org/GNOME/libxml2/-/releases/v2.10.3
MFH: 2022Q4
(cherry picked from commit def7c5c7f488af35bcca2a2cd1dcf8ff54b41223)