Chore(deps): Bump langchain in /src/conversation-api

Bumps [langchain](https://github.com/langchain-ai/langchain) from 0.0.345 to 0.1.4.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@v0.0.345...v0.1.4)

---
updated-dependencies:
- dependency-name: langchain
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

src/conversation-api/requirements.txt

@@ -8,7 +8,7 @@ azure-monitor-opentelemetry==1.1.0
 azure-search-documents==11.4.0
 fastapi==0.104.1
 googlemaps==4.10.0
-langchain==0.0.345
+langchain==0.1.4
 mmh3==4.0.1
 numexpr==2.8.7
 openai==1.3.7