[libxml2] Update to 2.14.5

[Thomas1664]

Fixes #46739
Fixes #45591
Fixes #44906

• Changes comply with the maintainer guide.
• SHA512s are updated for each updated download.
• The "supports" clause reflects platforms that may be fixed by this new version.
• Any fixed CI baseline entries are removed from that file.
• Any patches that are no longer applied are deleted from the port's directory.
• The version database is fixed by rerunning ./vcpkg x-add-version --all and committing the result.
• Only one version is added to each modified port's versions file.

[dg0yt]

It might be time to get rid of librsvg, at least until there is a way to deal with rust and the cargo supply chain required by newer versions.