jp6/cu126: links for xgboost-cu12

root/pypi xgboost_cu12-3.1.2.tar.gz
root/pypi xgboost_cu12-3.1.1.tar.gz
root/pypi xgboost_cu12-3.1.0.tar.gz
root/pypi xgboost_cu12-3.1.0rc1.tar.gz