Just `poetry lock` and moving `langchain` to the latest version, in case
folks copy this template.
This resolves some vulnerable dependency alerts GitHub code scanning was
flagging.
**Description:** This is like the rag-conversation template in many
ways. What's different is:
- support for a timescale vector store.
- support for time-based filters.
- support for metadata filters.
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---------
Co-authored-by: Erick Friis <erick@langchain.dev>
