loongson/pypi: links for pretix-mandatory-product

loongson/mirror pretix-mandatory-product-1.3.1.tar.gz
loongson/mirror pretix-mandatory-product-1.3.0.tar.gz
loongson/mirror pretix-mandatory-product-1.2.0.tar.gz
loongson/mirror pretix-mandatory-product-1.1.0.tar.gz
loongson/mirror pretix-mandatory-product-1.0.0.tar.gz