loongson/pypi: links for pypiserver-backend-s3

loongson/mirror pypiserver-backend-s3-0.0.2.tar.gz
loongson/mirror pypiserver_backend_s3-0.0.2-py3-none-any.whl
loongson/mirror pypiserver-backend-s3-0.0.1.tar.gz
loongson/mirror pypiserver_backend_s3-0.0.1-py3-none-any.whl