loongson/mirror: links for sky-bkg

loongson/mirror sky_bkg-0.1.3.tar.gz
loongson/mirror sky_bkg-0.1.2.tar.gz
loongson/mirror sky_bkg-0.1.1.tar.gz
loongson/mirror sky_bkg-0.1.1-py3-none-any.whl
loongson/mirror sky_bkg-0.1.0.tar.gz
loongson/mirror sky_bkg-0.1.0-py3-none-any.whl