Remove numpy version pin when able

[kmohrman]

Note that we have pinned the numpy version in the environment.yml file (to numpy=1.23.5) as a workaround to the numpy.bool error that we otherwise get (from one of the coffea files). This is implemented in PR #354.

This should be revisited at some point (e.g. once coffea has fixed the numpy.bool instance, or once conda has figured out how to make a consistent environment that does not lead to this error) to remove the numpy version pin.

[bryates]

The numpy.bool issu was addressed in Coffea v0.7.22 scikit-hep/coffea#901. We can now unpin numpy.

[bryates]

There are still some issues with our repo and numpy, so I'm reopening this for later. (see #405)

[bryates]

Now there is an issue with numpy 2.0, so we'll have to keep this a bit longer. Hopefully the calendar coffea transition will eventually remove the need to pin numpy.