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Auto merge of #149037 - alexcrichton:update-wasi-sdk, r=jieyouxu
Update wasm-related dependencies in CI
* Update to wasi-sdk-29 released today
* Update to Wasmtime 38.0.4 which was released a week or so ago
This is the same as rust-lang/rust#148611, except with wasi-sdk-29 to fixup some issues found in wasi-sdk-28.
