pkg_resources update breaks bngl

I'm getting this error when importing bionetgen in python:

```
/opt/hostedtoolcache/Python/3.9.9/x64/lib/python3.9/site-packages/bionetgen/main.py:21: in <module>
    from pkg_resources import packaging
E   ImportError: cannot import name 'packaging' from 'pkg_resources' (/opt/hostedtoolcache/Python/3.9.9/x64/lib/python3.9/site-packages/pkg_resources/__init__.py)
```
