Update langgraph dependency

Author: NoahStapp

libs/langchain-mongodb/pyproject.toml

@@ -38,7 +38,7 @@ dev = [
     "langchain-openai>=1.0",
     "langchain-community>=0.3.27",
     "pypdf>=5.0.1",
-    "langgraph>=0.2.72",
+    "langgraph>=1.0.0",
     "flaky>=3.8.1",
     "langchain-tests==0.3.22",
     "pip>=25.0.1",