Fix import order

Author: gmazoyer

tests/unit/sdk/test_node.py

@@ -11,9 +11,9 @@
     InfrahubNodeBase,
     InfrahubNodeSync,
     RelatedNodeBase,
+    RelationshipManager,
     RelationshipManagerBase,
     parse_human_friendly_id,
-    RelationshipManager,
 )
 from infrahub_sdk.node.constants import SAFE_VALUE
 from infrahub_sdk.node.related_node import RelatedNode, RelatedNodeSync