Update jupyterlab-chat to 0.18.x (#16)

Author: 3coins

pyproject.toml

@@ -37,7 +37,7 @@ dependencies = [
     "deepmerge>=2.0,<3",
     # NOTE: Make sure to update the corresponding dependency in
     # `packages/jupyter-ai/package.json` to match the version range below
-    "jupyterlab-chat>=0.17.0,<0.18.0",
+    "jupyterlab-chat>=0.18.0,<0.19.0",
     "jupyter_ai_litellm>=0.0.1",
     "jinja2>=3.0,<4",
     "python_dotenv>=1,<2",