Update pipeline.py

pipeline.py

@@ -8,7 +8,7 @@ from typing import Optional, Dict, Any
 # (Optional) from langchain.schema import RunnableConfig
 # If you have the latest "langchain_core", use from langchain_core.runnables.base import Runnable
 # or from langchain.runnables.base import Runnable (depending on your version)
-from langchain.runnables.base import Runnable
+from langchain_core.runnables.base import Runnable
 
 from langchain.docstore.document import Document
 from langchain.embeddings import HuggingFaceEmbeddings