chore(deps): update dependency pytest to v9

Author: renovate-bot

pyproject.toml

@@ -47,7 +47,7 @@ test = [
     "isort==7.0.0; python_version >= '3.10'",
     "mypy==1.18.2",
     "pytest-asyncio==0.26.0",
-    "pytest==8.4.2",
+    "pytest==9.0.1",
     "pytest-cov==7.0.0",
     "langchain-tests==0.3.22",
     "langgraph==0.6.10"