loongson/pypi: links for opencv-python-headless

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

loongson/pypi opencv_python_headless-4.10.0.84-cp39-cp39-linux_loongarch64.whl
loongson/pypi opencv_python_headless-4.10.0.84-cp310-cp310-linux_loongarch64.whl
loongson/pypi opencv_python_headless-4.7.0.72-cp38-cp38-linux_loongarch64.whl