loongson/pypi: links for cs-dateutils

loongson/mirror cs_dateutils-20250724.tar.gz
loongson/mirror cs_dateutils-20250724-py2.py3-none-any.whl
loongson/mirror cs.dateutils-20230210.tar.gz
loongson/mirror cs.dateutils-20230210-py3-none-any.whl
loongson/mirror cs.dateutils-20210306.tar.gz