fix import issue

Author: Matt Sokoloff

labelbox/data/serialization/labelbox_v1/converter.py

@@ -19,7 +19,7 @@ class LBV1Converter:
 
     @staticmethod
     def deserialize_video(json_data: Iterable[Dict[str, Any]],
-                          client: labelbox.Client):
+                          client: "labelbox.Client"):
         """
         Converts a labelbox video export into the common labelbox format.