loongson/pypi: links for rustc-dev-t-x64-win-msvc-nightly-p3

loongson/mirror rustc_dev_t_x64_win_msvc_nightly_p3-1.91.0.tar.gz
loongson/mirror rustc_dev_t_x64_win_msvc_nightly_p3-1.91.0-py3-none-any.whl