loongson/pypi: links for ujson

INFO: Because this project isn't in the mirror_whitelist, no releases from root/pypi are included.

loongson/pypi ujson-5.10.0-cp38-cp38-linux_loongarch64.whl
loongson/pypi ujson-5.7.0.tar.gz
loongson/pypi ujson-5.7.0-cp39-cp39-linux_loongarch64.whl
loongson/pypi ujson-1.35.tar.gz
loongson/pypi ujson-1.35-cp39-cp39-linux_loongarch64.whl
loongson/pypi ujson-1.35-cp37-cp37m-linux_loongarch64.whl
loongson/pypi ujson-1.35-cp36-cp36m-linux_loongarch64.whl
loongson/pypi ujson-1.35-cp27-cp27mu-linux_loongarch64.whl