Update Nokogiri to v1.15.2

Stan Hurequested to merge
sh-update-nokogiri into master

What does this MR do and why?

The update in libxml2 (https://gitlab.gnome.org/GNOME/libxml2/-/releases/v2.11.0) stopped escaping ASCII characters in HTML: https://gitlab.gnome.org/GNOME/libxml2/-/issues/321. Update the Markdown snapshot accordingly.

Set the libxml2 memory allocator via NOKOGIRI_LIBXML_MEMORY_MANAGEMENT=default to work around Ruby interpreter bug. This variable can be dropped once https://github.com/ruby/ruby/pull/7663 ships with a Ruby interpreter that is used.

Relates to #390313 (closed)

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Edited by Stan Hu

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