loongson/pypi: links for sequana-downsampling

loongson/mirror sequana_downsampling-0.9.0.tar.gz
loongson/mirror sequana_downsampling-0.8.4.tar.gz
loongson/mirror sequana_downsampling-0.8.3.tar.gz
loongson/mirror sequana_downsampling-0.8.2.tar.gz
loongson/mirror sequana_downsampling-0.8.0.tar.gz