rustup target add wasm32-wasi 404

[wanglong001]

https://github.com/tuna/issues/issues/1961

info: syncing channel updates for '1.78-x86_64-pc-windows-msvc' info: downloading component 'rust' error: could not download nonexistent rust version 1.78-x86_64-pc-windows-msvc: could not download file from 'https://mirrors.tuna.tsinghua.edu.cn/rustup/dist/rust-1.78-x86_64-pc-windows-msvc.tar.gz.sha256' to 'C:\Users\40613.rustup\tmp\vkls403fnko_t5i4_file': http request returned an unsuccessful status code: 404