Remove `cargo machete` step from RELEASES.md #12878

Job	Run time
Format + check + test	5m 56s
Check wasm32 + wasm-bindgen	2m 25s
android	29s
cargo-deny aarch64-apple-darwin	39s
Check wasm32+atomics	1m 21s
ios	34s
cargo-deny aarch64-linux-android	1m 10s
Check Windows	2m 6s
cargo-deny i686-pc-windows-gnu	36s
cargo-deny i686-pc-windows-msvc	36s
cargo-deny i686-unknown-linux-gnu	37s
cargo-deny wasm32-unknown-unknown	37s
cargo-deny x86_64-apple-darwin	36s
cargo-deny x86_64-pc-windows-gnu	36s
cargo-deny x86_64-pc-windows-msvc	36s
cargo-deny x86_64-unknown-linux-gnu	37s
cargo-deny x86_64-unknown-linux-musl	34s
cargo-deny x86_64-unknown-redox	36s
	20m 41s

Provide feedback