chore(deps): bump langsmith from 0.4.9 to 0.4.39

Bumps [langsmith](https://github.com/langchain-ai/langsmith-sdk) from 0.4.9 to 0.4.39.
- [Release notes](https://github.com/langchain-ai/langsmith-sdk/releases)
- [Commits](langchain-ai/langsmith-sdk@v0.4.9...v0.4.39)

---
updated-dependencies:
- dependency-name: langsmith
  dependency-version: 0.4.39
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

requirements/base.txt

@@ -9,7 +9,7 @@ langchain-pinecone==0.2.12
 langchain-tests==0.3.20
 langchain-text-splitters==0.3.9
 langchainhub==0.1.21
-langsmith==0.4.9
+langsmith==0.4.39
 openai==2.6.1
 pinecone==7.3.0
 pinecone-text