Bump langsmith from 0.0.38 to 0.0.40

Bumps [langsmith](https://github.com/langchain-ai/langsmith-sdk) from 0.0.38 to 0.0.40.
- [Release notes](https://github.com/langchain-ai/langsmith-sdk/releases)
- [Commits](https://github.com/langchain-ai/langsmith-sdk/compare/v0.0.38...v0.0.40)

---
updated-dependencies:
- dependency-name: langsmith
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==0.3.11
 faiss-cpu==1.7.4
 langchain==0.0.293
-langsmith==0.0.38
+langsmith==0.0.40
 openai==0.28.0
 pypdf==3.16.1
 streamlit==1.27.0