Bump langsmith from 0.1.145 to 0.3.1

Bumps [langsmith](https://github.com/langchain-ai/langsmith-sdk) from 0.1.145 to 0.3.1.
- [Release notes](https://github.com/langchain-ai/langsmith-sdk/releases)
- [Commits](langchain-ai/langsmith-sdk@v0.1.145...v0.3.1)

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

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

Author: dependabot[bot]

requirements.txt

@@ -25,7 +25,7 @@ langchain-community==0.3.8
 langchain-core==0.3.29
 langchain-openai==0.2.9
 langchain-text-splitters==0.3.5
-langsmith==0.1.145
+langsmith==0.3.1
 markdown-it-py==3.0.0
 marshmallow==3.23.1
 mdurl==0.1.2