fix(deps): update dependency langchain-core to v1

Author: renovate[bot]

pyproject.toml

@@ -40,7 +40,7 @@ gunicorn = "^23.0.0"
 ipython = "^9.0.0"
 langchain = "^0.3.13"
 langchain-community = "^0.3.16"
-langchain-core = "^0.3.31"
+langchain-core = "^1.0.0"
 langchain-litellm = "^0.3.0"
 langchain-openai = "^0.3.0"
 langgraph = "^0.6.6"