update langgraph to 0.0.61 (#317)

Author: vbarda

poetry.lock

@@ -17,7 +17,7 @@ langchain-google-genai = ">=1.0.5,<2.0.0"
 langchain-anthropic = "^0.1.13"
 langchain-fireworks = "^0.1.3"
 langserve = {extras = ["server"], version = "^0.2.0"}
-langgraph = "^0.0.60"
+langgraph = "^0.0.61"
 langgraph-cli= ">=0.1.21,<0.2.0"
 fastapi = "^0.103.1"
 pydantic = "1.10"