The core/jquery.once library was deprecated in Drupal 9 and removed in Drupal 10. While the Facets module appears to have removed use of the library in code, it is still listed as a dependency in two widget submodules: facets_range_widget and facets_searchbox_widget.
A search of both submodule's JavaScript reveals no use of the once() function, jQuery or core, so it can be removed as being both deprecated and disused.
Remove reference to these libraries in each submodule's libraries.yml file.
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Trying out the web IDE for this simple change. Hopefully it all worked properly! I think I missed the chance to give the commit a proper message.