Fix import

Author: gmazoyer

backend/infrahub/core/migrations/graph/m043_backfill_hfid_display_label_in_db.py

@@ -21,7 +21,6 @@
 from ..shared import MigrationRequiringRebase
 
 if TYPE_CHECKING:
-    from infrahub.core.branch import Branch
     from infrahub.core.schema.basenode_schema import SchemaAttributePath
     from infrahub.core.schema.schema_branch import SchemaBranch
     from infrahub.database import InfrahubDatabase