pyhc-core[tests] was removed (dependency conflicts)

[sapols]

I recently migrated the PyHC environment to Python 3.12.

pyhc-core[tests] was removed because it was the root cause of dependency conflicts.

I recall it trying to pull in sunpy[tests] which required s3transfer>=14 while our env requires s3transfer>=13,<14—but maybe that could be resolved?

There's also a possibility that Kamodo's outdated dependencies were a problem.

I've opened this issue in the pyhc-core repo to fix this. Once fixed, re-add pyhc-core[tests] to the PyHC Environment (and make sure it pulls in the correct dependencies to run PySPEDAS & SunPy unit tests in unit-tests.ipynb—e.g. osbpy, mth5, sunpy[tests])!