new importlib versions break file imports

[erexer]

using

importlib_metadata  8.0.0
importlib_resources 6.4.0

breaks importing files

in mcmc.ipynb, load_hymod_input_file() fails because it looks at the virtual environment rather than the msdbook/data dir

works with the older versions

importlib-metadata  4.11.3
importlib-resources 5.7.1