dependency: (deps): bump langsmith from 0.0.40 to 0.0.42

Bumps [langsmith](https://github.com/langchain-ai/langsmith-sdk) from 0.0.40 to 0.0.42.
- [Release notes](https://github.com/langchain-ai/langsmith-sdk/releases)
- [Commits](langchain-ai/langsmith-sdk@v0.0.40...v0.0.42)

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

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

requirements.txt

@@ -16,7 +16,7 @@ ibm-watson==7.0.1
 idna==3.4
 iniconfig==2.0.0
 langchain==0.0.306
-langsmith==0.0.40
+langsmith==0.0.42
 marshmallow==3.20.1
 multidict==6.0.4
 mypy-extensions==1.0.0