Bump langsmith from 0.3.42 to 0.3.43 (#554)

Bumps [langsmith](https://github.com/langchain-ai/langsmith-sdk) from 0.3.42 to 0.3.43.
- [Release notes](https://github.com/langchain-ai/langsmith-sdk/releases)
- [Commits](langchain-ai/langsmith-sdk@v0.3.42...v0.3.43)

---
updated-dependencies:
- dependency-name: langsmith
  dependency-version: 0.3.43
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]