chore(deps): bump langchain from 0.0.341 to 0.0.343

Bumps [langchain](https://github.com/langchain-ai/langchain) from 0.0.341 to 0.0.343.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@v0.0.341...v0.0.343)

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

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

Author: dependabot[bot]

requirements.txt

@@ -21,5 +21,5 @@ codespell==2.2.6
 # ------------
 python-dotenv==1.0.0
 pydantic==2.5.2
-langchain==0.0.341
+langchain==0.0.343
 pinecone-client==2.2.4