fix linting, formating errors in robot-server

robot-server/robot_server/subsystems/firmware_update_manager.py

@@ -148,6 +148,8 @@ def __init__(
         self._status_cache_lock = Lock()
         self._created_at = created_at
         self._update_id = update_id
+        # mypy thinks this is assignment to a method, which it is not. that means
+        # it's ok to assign this and it's also okay to not take a self argument
         self._complete_callback = complete_callback
 
     @property
@@ -204,6 +206,8 @@ async def _update_task(self) -> None:
                 UpdateProgress(UpdateState.failed, last_progress, be)
             )
         finally:
+            # mypy continues to think this is a method but it is a function stored in an
+            # attribute and therefore does not need a self argument
             await self._complete_callback()
 
     def get_handle(self) -> "UpdateProcessHandle":