Fix step reasoning serialization

Author: Val Brodsky

libs/labelbox/src/labelbox/schema/tool_building/step_reasoning_tool.py

@@ -9,9 +9,10 @@
 class StepReasoningVariant:
     id: int
     name: str
+    actions: List[str] = field(default_factory=list)
 
     def asdict(self) -> Dict[str, Any]:
-        return {"id": self.id, "name": self.name}
+        return {"id": self.id, "name": self.name, "actions": self.actions}
 
 
 @dataclass