Bump langchain from 0.0.348 to 0.0.350

Bumps [langchain](https://github.com/langchain-ai/langchain) from 0.0.348 to 0.0.350.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](https://github.com/langchain-ai/langchain/compare/v0.0.348...v0.0.350)

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

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

requirements.txt

@@ -1,7 +1,7 @@
 anthropic==0.7.7
 faiss-cpu==1.7.4
 huggingface-hub==0.19.4
-langchain==0.0.348
+langchain==0.0.350
 langsmith==0.0.69
 openai==1.3.8
 pydantic==2.5.2