loongson/mirror: links for snap-to-bucket

loongson/mirror snap_to_bucket-1.0.4.tar.gz
loongson/mirror snap_to_bucket-1.0.4-py3-none-any.whl
loongson/mirror snap_to_bucket-1.0.3.tar.gz
loongson/mirror snap_to_bucket-1.0.3-py3-none-any.whl