loongson/mirror: links for check-syncrepl-extended

loongson/mirror check_syncrepl_extended-2020.13.1.tar.gz
loongson/mirror check_syncrepl_extended-2020.13.1-py3-none-any.whl
loongson/mirror check_syncrepl_extended-2020.13.0.tar.gz
loongson/mirror check_syncrepl_extended-2020.13.0-py3-none-any.whl