loongson/pypi: links for fairseq-fixed

loongson/mirror fairseq_fixed-0.12.3.1.tar.gz
loongson/mirror fairseq_fixed-0.12.3.1-cp312-cp312-win_amd64.whl
loongson/mirror fairseq_fixed-0.12.3.1-cp312-cp312-manylinux_2_28_x86_64.whl