This might be coming from jupyter-server package; it was fixed a month ago in Fix jupyter_client warning by martinRenou · Pull Request #581 · jupyter-server/jupyter_server · GitHub and released in 1.11.0 a week ago, so you should be able to update:
pip install -U "jupyter_server>=1.11.0"
# or if using conda/mamba:
# conda install "jupyter_server>=1.11.0" -c conda-forge