Update langgraph requirement in /topic/machine-learning/langchain

Updates the requirements on [langgraph](https://github.com/langchain-ai/langgraph) to permit the latest version.
- [Release notes](https://github.com/langchain-ai/langgraph/releases)
- [Commits](langchain-ai/langgraph@langgraph-cli==0.1.39...1.0.0)

---
updated-dependencies:
- dependency-name: langgraph
  dependency-version: 1.0.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

topic/machine-learning/langchain/requirements.txt

@@ -6,7 +6,7 @@ langchain-mcp-adapters<0.2
 langchain-google-vertexai<4
 langchain-openai<0.4
 langchain-text-splitters<1.1
-langgraph<0.7
+langgraph<1.1
 pueblo[cli,nlp]>=0.0.10
 pypdf<7
 python-dotenv<2