loongson/pypi: links for subprocess-middleware-c4

loongson/mirror subprocess-middleware-c4-0.4.0.0b1.tar.gz
loongson/mirror subprocess_middleware_c4-0.4.0.0b1-py3-none-any.whl
loongson/mirror subprocess-middleware-c4-0.4.0.0b0.tar.gz
loongson/mirror subprocess_middleware_c4-0.4.0.0b0-py3-none-any.whl