ci: fix notebook runner & VCR cassette recorder (#1849)

Co-authored-by: vbarda <vadym@langchain.dev>

docs/docs/tutorials/chatbot-simulation-evaluation/agent-simulation-evaluation.ipynb

@@ -407,7 +407,7 @@
     }
    ],
    "source": [
-    "for chunk in simulation.stream({}):\n",
+    "for chunk in simulation.stream({\"messages\":[]}):\n",
     "    # Print out all events aside from the final end chunk\n",
     "    if END not in chunk:\n",
     "        print(chunk)\n",