Add a `cargo machete` CI step #12879

Job	Run time
Format + check + test	6m 11s
android	26s
cargo-deny aarch64-apple-darwin	38s
cargo-deny aarch64-linux-android	37s
cargo-deny i686-pc-windows-gnu	38s
cargo-deny i686-pc-windows-msvc	39s
cargo-deny i686-unknown-linux-gnu	37s
cargo-deny wasm32-unknown-unknown	38s
cargo-deny x86_64-apple-darwin	37s
cargo-deny x86_64-pc-windows-gnu	38s
Check wasm32 + wasm-bindgen	2m 38s
cargo-deny x86_64-pc-windows-msvc	37s
Check wasm32+atomics	1m 18s
cargo-deny x86_64-unknown-linux-gnu	36s
ios	21s
cargo-deny x86_64-unknown-linux-musl	38s
Check Windows	1m 57s
cargo-deny x86_64-unknown-redox	54s
	20m 38s

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