[PRQ#46157] Deletion Request for python-hep_ml

MarsSeed [1] filed a deletion request for python-hep_ml [2]: Orphan, niche OOD scientific package from 2022-03. Not useful to keep here as is. Latest version can be installed from PyPI or GitHub for those who work with high-energy physics and machine learning within that field. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/python-hep_ml/