Fix linter error: remove whitespace from blank line in worker.py

Co-authored-by: berndverst <[email protected]>

Author: Copilot

durabletask/worker.py

@@ -859,7 +859,7 @@ def send_event(self, instance_id: str, event_name: str, *,
             raise ValueError("instance_id cannot be None or empty")
         if not event_name:
             raise ValueError("event_name cannot be None or empty")
-        
+
         id = self.next_sequence_number()
         encoded_data = shared.to_json(data) if data is not None else None
         action = ph.new_send_event_action(id, instance_id, event_name, encoded_data)