Rollup merge of #134227 - alexcrichton:update-wasi-sdk, r=lqd

Update wasi-sdk used to build WASI targets

Bump to the latest wasi-sdk-25 release which brings in various wasi-libc updates as well as LLVM 19 as the version used to compile wasi-libc.

- https://github.com/WebAssembly/wasi-sdk/releases/tag/wasi-sdk-24
- https://github.com/WebAssembly/wasi-sdk/releases/tag/wasi-sdk-25

Author: matthiaskrgr