Log Message:
ruby-nokogiri: update to 1.15.4.

Upstream changes:
 https://github.com/sparklemotion/nokogiri/releases/tag/v1.15.4

1.15.4 / 2023-08-11

Dependencies

  * [CRuby] Vendored libxml2 is updated to v2.11.5 from v2.11.4. For details
    please see https://gitlab.gnome.org/GNOME/libxml2/-/releases/v2.11.5

Fixed

  * Fixed a typo in a HTML5 parser error message. [#2927] (Thanks,
    @anishathalye!)
  * [CRuby] ObjectSpace.memsize_of is now safe to call on Documents with
    complex DTDs. In previous versions, this debugging method could result in a
    segfault. [#2923, #2924]