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

Bumps [langchain](https://github.com/langchain-ai/langchain) from 0.0.249 to 0.1.0.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@v0.0.249...v0.1.0)

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

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

src/conversation-api/requirements.txt

@@ -6,7 +6,7 @@ azure-cosmos==4.4.0
 azure-identity==1.13.0
 azure-monitor-opentelemetry==1.0.0b14
 fastapi==0.100.1
-langchain==0.0.249
+langchain==0.1.0
 mmh3==4.0.1
 openai==0.27.8
 opentelemetry-instrumentation-fastapi==0.39b0