fix(deps): update dependency langgraph to v1

Author: renovate[bot]

pyproject.toml

@@ -43,7 +43,7 @@ langchain-community = "^0.3.16"
 langchain-core = "^0.3.31"
 langchain-litellm = "^0.3.0"
 langchain-openai = "^0.3.0"
-langgraph = "^0.6.6"
+langgraph = "^1.0.0"
 langgraph-checkpoint-postgres = "^2.0.13"
 langmem = "^0.0.29"
 langsmith = "^0.4.21"