chore(python-deps): bump langsmith from 0.8.3 to 0.8.18

Bumps [langsmith](https://github.com/langchain-ai/langsmith-sdk) from 0.8.3 to 0.8.18.
- [Release notes](https://github.com/langchain-ai/langsmith-sdk/releases)
- [Commits](langchain-ai/langsmith-sdk@v0.8.3...v0.8.18)

---
updated-dependencies:
- dependency-name: langsmith
  dependency-version: 0.8.18
  dependency-type: indirect
...

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

Author: dependabot[bot]