fix: Update config to enable caching in vector store RAG test.

src/backend/tests/unit/initial_setup/starter_projects/test_vector_store_rag.py

@@ -112,7 +112,7 @@ def test_vector_store_rag(ingestion_graph, rag_graph):
     ]
     for ids, graph, len_results in zip([ingestion_ids, rag_ids], [ingestion_graph, rag_graph], [5, 8]):
         results = []
-        for result in graph.start(config={"output": True}):
+        for result in graph.start(config={"output": {"cache": True}}):
             results.append(result)
 
         assert len(results) == len_results