loongson/pypi: links for buckling

loongson/mirror buckling-2026b4.tar.gz
loongson/mirror buckling-2026b4-py3-none-any.whl
loongson/mirror buckling-2026b3.tar.gz
loongson/mirror buckling-2026b3-py3-none-any.whl
loongson/mirror buckling-2026b2.tar.gz
loongson/mirror buckling-2026b2-py3-none-any.whl