Secret.Collection.prototype.set_label_sync
function set_label_sync(label: String, cancellable: Gio.Cancellable): Boolean {
    // Gjs wrapper for secret_collection_set_label_sync()
}
  Set the label of this collection.
This function may block indefinetely. Use the asynchronous version in user interface threads.
- label
 a new label
- cancellable
 optional cancellation object
- Returns
 whether the change was successful or not