Fix publish CI.

[MeirShpilraien]

Added extra-traits feature to syn dependency so we will get the Debug trait implementation.

[MeirShpilraien]

Should fix this failure: https://github.com/RedisLabsModules/redismodule-rs/actions/runs/4879208532/jobs/8705557599

[iddm]

I wonder how has it ever been compiled? By the way, the syn::Ident has Debug, and the ItemFn has Debug when the extra-traits feature is used. As long as it is useful, I would have it. When I was writing the proc-macro, I was also using the Debug trait's output as it was helpful.

[MeirShpilraien]

I wonder how has it ever been compiled

Yes I also wonder the same thing. If you compile the crate itself it does not compile. But I guess we never really tried it and we just use it on the redismodule-rs crate which does seem to work.