Python API interactive widgets broken

[sgpearse]

To reproduce on Casper:

1. Download the 3.11 tar.bz2 installer from our release test directory and put configure your channel

2. Run the following

mkdir -p channel/linux-64
mv ~/Downloads/vapor-3.11.0-h2bc3f7f_0.tar.bz2 !$
module load conda
conda config --add channels conda-forge
conda config --add channels ncar-vapor
conda create -n 3.11v5 python=3.10 conda-build
conda activate 3.11v5
python -m conda_index channel
conda install -c file:///glade/u/home/pearse/channel vapor
cd $CONDA_INDEX/lib/python3.10/site-packages/vapor/example_notebooks
jupyter notebook

3. Run all cells in visualizer_widget_example.ipynb. Kernel will die in cell 4.