chore: pin @langchain/langgraph to version 0.2.44 across all package.json files (CopilotKit#2034)

Author: suhasdeshpande

CopilotKit/packages/sdk-js/package.json

@@ -62,7 +62,7 @@
     "@copilotkit/shared": "workspace:*",
     "@langchain/community": "^0.0.53",
     "@langchain/core": "^0.3.13",
-    "@langchain/langgraph": "^0.2.44",
+    "@langchain/langgraph": "0.2.44",
     "langchain": "^0.3.3",
     "zod": "^3.23.3"
   },