remove another problematic import

Author: Matt Sokoloff

labelbox/schema/bulk_import_request.py

@@ -15,7 +15,6 @@
                     Type, Set, TYPE_CHECKING)
 
 from labelbox import exceptions as lb_exceptions
-from labelbox.data.ontology import get_feature_schema_lookup
 from labelbox.orm.model import Entity
 from labelbox import utils
 from labelbox.orm import query