Bump langsmith from 0.8.4 to 0.8.18

Bumps [langsmith](https://github.com/langchain-ai/langsmith-sdk) from 0.8.4 to 0.8.18.
- [Release notes](https://github.com/langchain-ai/langsmith-sdk/releases)
- [Commits](langchain-ai/langsmith-sdk@v0.8.4...v0.8.18)

---
updated-dependencies:
- dependency-name: langsmith
  dependency-version: 0.8.18
  dependency-type: direct:production
...

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

Author: dependabot[bot]

pyproject.toml

@@ -49,7 +49,7 @@ dependencies = [
 	"langgraph-prebuilt==1.1.0",
 	"langgraph-sdk==0.3.14",
 	"langgraph==1.2.0",
-	"langsmith==0.8.4",
+	"langsmith==0.8.18",
 	"libipld==3.3.2",
 	"librt==0.11.0",
 	"markdown==3.10.2",