Fix CI: Update langgraph version for sqlite checkpoint support

- Update langgraph version from >=0.1.0 to >=0.2.0
- Resolves ModuleNotFoundError for langgraph.checkpoint.sqlite

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: jeremymanning

pyproject.toml

@@ -42,7 +42,7 @@ dependencies = [
     # LangChain for structured outputs
     "langchain>=0.1.0",
     "langchain-core>=0.1.0",
-    "langgraph>=0.1.0",
+    "langgraph>=0.2.0",
     # Web search and browser automation
     "requests>=2.28.0",
     "beautifulsoup4>=4.11.0",