loongson/pypi: links for openswitcher-proxy

loongson/mirror openswitcher_proxy-0.12.3-py3-none-any.whl
loongson/mirror openswitcher_proxy-0.12.2.tar.gz
loongson/mirror openswitcher_proxy-0.12.1.tar.gz
loongson/mirror openswitcher_proxy-0.12.0.tar.gz