loongson/pypi: links for mysql-connector

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

loongson/pypi mysql_connector-2.2.9-cp37-cp37m-linux_loongarch64.whl
loongson/pypi mysql_connector-2.2.9-cp27-cp27mu-linux_loongarch64.whl