The problem is that #1017905 probably blocks the whole thing from being updated which is likely needed for resvg if you want to introduce a newer upstream (that is, if you want to do that. the rust GTK bindings had some API incompatibility issues between versions). Updating and uploading the GTK stack is on my todo-list but tbh I don't see why I should prioritize it if I don't know if it will be rejected.
Cheers werdahias