chore: resolve langchain integration dependabot alerts (#424)

Author: AbhiPrasad

integrations/langchain-py/pyproject.toml

@@ -49,9 +49,9 @@ braintrust = { path = "../../py", editable = true }
 dev = [
     "build",
     "httpx",
-    "langchain-anthropic>=0.3.20",
-    "langchain-openai",
-    "langgraph>=0.2.1,<0.4.0",
+    "langchain-anthropic>=1.3.0",
+    "langchain-openai>=1.2.1",
+    "langgraph>=1.2.0",
     "pre-commit",
     "pytest",
     "pytest-asyncio>=1.1.0",