Look into cargo-machete to replace cargo-udeps

[syl20bnr]

From @Luni-4 on discord:

we should replace cargo-udeps with cargo-machete which runs on stable and it's faster

We use cargo-udeps in our dependencies xtask command here https://github.com/Tracel-AI/burn/blob/main/xtask/src/dependencies.rs#L88

This issue is about replacing it with cargo-machete.

Blog post about cargo-machete: https://bouvier.cc/2022/04/27/cargo-machete/