Update langgraph requirement from >=0.0.29,<0.1 to >=0.0.29,<0.3

---
updated-dependencies:
- dependency-name: langgraph
  dependency-type: direct:production
...

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

pyproject.toml

@@ -21,7 +21,7 @@ fastapi = ">=0.104.1"
 python-multipart = ">=0.0.6"
 markdown = ">=3.5.1"
 langchain = "^0.2"
-langgraph = ">=0.0.29,<0.1"
+langgraph = ">=0.0.29,<0.3"
 langchain_community = "^0.2"
 langchain-openai = "^0.1"
 tavily-python = ">=0.2.8"