css: Deprecate :sorted pseudo class
css: Deprecate :sorted pseudo class

This was used with regions in GtkTreeView, and is not used
anymore, so deprecate it.

grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita