[backend] Update to the latest version of beat.core

beat/web/scripts/scheduler.py

@@ -324,7 +324,7 @@ def main(user_input=None):
                             split_to_cancel.job.block.experiment.fullname(),
                             split_to_cancel.worker.name)
 
-                worker_controller.cancel(split_to_cancel.worker.name)
+                worker_controller.cancel(split_to_cancel.worker.name, split_to_cancel.id)
                 remove_split_id_from(running_job_splits, split_to_cancel.id)
                 cancelling_jobs.append(split_to_cancel.id)