loongson/pypi: links for xside

loongson/mirror xside-2026.1.5a0.tar.gz
loongson/mirror xside-2026.1.5a0-cp311-cp311-win_amd64.whl
loongson/mirror xside-2026.1.5a0-cp311-cp311-macosx_11_0_arm64.whl