loongson/pypi: links for stitching-headless

loongson/mirror stitching_headless-0.6.1.tar.gz
loongson/mirror stitching_headless-0.6.1-py3-none-any.whl
loongson/mirror stitching_headless-0.5.4.tar.gz
loongson/mirror stitching_headless-0.5.4-py3-none-any.whl