[Crate] Bump rustfmt version to 1.6.0

[Douile]

According to vim on linux (and after cloning into a new folder)

On this branch:

• src/errors.rs is LF
• src/socket.rs is LF

on main branch:

• src/errors.rs is CRLF
• src/socket.rs is LF

I am very confused :joy:

[CosminPerRam]

I'll merge this as it is and I'll check the stuff behind line endings afterwards.