Bump langchain from 0.0.331 to 0.0.349

Bumps [langchain](https://github.com/langchain-ai/langchain) from 0.0.331 to 0.0.349.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@v0.0.331...v0.0.349)

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

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -1,7 +1,7 @@
 # On Apple Silicon: pip uninstall grpcio -y; conda install grpcio -y
 nomic==2.0.14
 protobuf==4.25.0
-langchain==0.0.331
+langchain==0.0.349
 click==8.1.7
 aiohttp==3.8.6
 MarkupSafe==2.1.3