Bump langchain in /archived/notebooks/workshops/chatbot-apps

Bumps [langchain](https://github.com/langchain-ai/langchain) from 0.0.195 to 0.2.3.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@v0.0.195...langchain==0.2.3)

---
updated-dependencies:
- dependency-name: langchain
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

archived/notebooks/workshops/chatbot-apps/requirements.txt

@@ -1,6 +1,6 @@
 boto3==1.26.150
 botocore==1.29.150
-langchain==0.0.195
+langchain==0.2.3
 faiss-cpu==1.7.4
 unstructured==0.9.3 
 langchainplus-sdk==0.0.8