fix: HTML4::Document.to_xhtml self-closing tags (v1.12.x) #2327
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Commit 1d06b4f introduced NO_EMPTY_TAGS into SaveOptions::DEFAULT_XHTML which libxml2 ignored due to a long-standing bug in serialization. libxml2 v2.9.11 fixed that serialization bug (https://gitlab.gnome.org/GNOME/libxml2/-/commit/dc6f009) and started paying attention to the NO_EMPTY_TAGS save option, resulting in seeing output containing, e.g. `<col></col>` instead of `<col/>`. This commit updates the default XHTML save options to drop the NO_EMPTY_TAGS flag, restoring this behavior. Closes #2324
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This is #2326 backported to v1.12.x for a patch release.