loongson/pypi: links for opencv-contrib-python

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

loongson/pypi opencv_contrib_python-4.6.0.66-cp38-cp38-linux_loongarch64.whl
loongson/pypi opencv_contrib_python-4.6.0.66-cp36-cp36m-linux_loongarch64.whl