from pkg_resources import packaging seems not work with setuptools>=70.0.0

[PawelPeczek-Roboflow]

There was a release of setuptools 70.0.0 (https://pypi.org/project/setuptools/#history) which mentions changes in pkg_resources: https://setuptools.pypa.io/en/stable/history.html#v70-0-0, that gets deprecated: https://setuptools.pypa.io/en/stable/pkg_resources.html.

That implies need for change of entries like that in clip.py module

if packaging.version.parse(torch.__version__) < packaging.version.parse("1.7.1"):
    warnings.warn("PyTorch version 1.7.1 or higher is recommended")

into something supported.

[JamieMartin]

I've opened a PR to fix this. Now works on my end.
#449
OR
#450
Depending on whether backward compatibility is desired.
Feel free to merge this if you need to get it working in the meantime.