Bump langchain from 0.1.6 to 0.1.7

Bumps [langchain](https://github.com/langchain-ai/langchain) from 0.1.6 to 0.1.7.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@v0.1.6...v0.1.7)

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

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

requirements.txt

@@ -7,4 +7,4 @@ flake8==7.0.0
 pre-commit==3.6.1
 pydantic==2.6.1
 PyYAML==6.0.1
-langchain==0.1.6
+langchain==0.1.7