Update src/workflow_nodes.py

src/workflow_nodes.py

@@ -689,7 +689,7 @@ def execute_notebook_node(state: InteractiveCaseStudyState) -> InteractiveCaseSt
 
     # 3. Write the skeleton notebook to disk
     nb_node = nbformat.from_dict(raw_nb)
-    nb_node.metadata.setdefault("kernelspec", {"name": "python3"})
+    nb_node.metadata.setdefault("kernelspec", {"name": "python3.9"})
     nb_node.metadata.setdefault("language_info", {"name": "python"})
     with open(raw_path, "w", encoding="utf-8") as f:
         nbformat.write(nb_node, f)