Update libxml2 to 2.13.5 #1679

Job	Run time
Run Coverity tests	0s
Run CodeQL tests	2m 59s
Build on Fedora 40	1m 7s
Build on macOS for macos	1m 59s
Build on Fedora 41	1m 2s
Build on macOS for iphoneos	1m 2s
Deploy pages	0s
Build on Fedora rawhide	57s
Build on Ubuntu 20.04	2m 32s
Build on macOS for iphonesimulator	1m 12s
Build on Ubuntu 22.04	2m 32s
Build on macOS for androidarm	1m 7s
Build on Ubuntu 24.04	2m 57s
Build on Windows (143, x86)	7m 10s
Build on macOS for androidarm64	1m 10s
Build on Ubuntu 24.10	2m 42s
Build on Windows (143, x64)	7m 11s
Build on macOS for androidx86_64	1m 1s
Build on Windows (143, arm64)	5m 52s
Build on Windows (142, x86)	6m 13s
Build on Windows (142, x64)	8m 13s
Build on Windows (142, arm64)	4m 33s
	1h 3m 31s

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