Update dependency libxml2 to v2.13.2

This MR contains the following updates:

Package	Update	Change
libxml2	patch	2.13.1 -> 2.13.2

MR created with the help of gitlab-org/frontend/renovate-gitlab-bot

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Release Notes

GNOME/libxml2 (libxml2)

v2.13.2: libxml2 2.13.2

Compare Source

Regressions

• tree: Fix handling of empty strings in xmlNodeParseContent
• valid: Restore ID lookup
• parser: Reenable ctxt->directory
• uri: Handle filesystem paths in xmlBuildRelativeURISafe
• encoding: Make xmlFindCharEncodingHandler return UTF-8 handler
• encoding: Fix encoding lookup with xmlOpenCharEncodingHandler
• include: Define ATTRIBUTE_UNUSED for clang
• uri: Fix xmlBuildURI with NULL base

Improvements

• uri: Enable Windows paths on Cygwin
• tests: Clarify licence of test/intsubset2.xml

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