fix missing manager call

Author: knifecake

steady_queue/__init__.py

@@ -1,7 +1,7 @@
 from datetime import timedelta
 from typing import Optional
 
-VERSION = (0, 1, "0b8")
+VERSION = (0, 1, "0b9")
 
 __version__ = ".".join(map(str, VERSION))
 

steady_queue/backend.py

@@ -28,7 +28,7 @@ def enqueue(
 
         task.args = args
         task.kwargs = kwargs
-        job = Job.enqueue(task, scheduled_at=task.run_after)
+        job = Job.objects.enqueue(task, scheduled_at=task.run_after)
         return self._to_task_result(task, job)
 
     def get_result(self, result_id: str) -> TaskResult: