Remove use of `issue = "0"` in submodules (stdarch, cargo, and rustfmt)

[rossmacarthur]

With #41260 resolved, issue = "0" in unstable attributes is disallowed in the compiler because issue = "none" should be used instead. However, some submodules haven't been updated to use this yet.

• stdarch (submodule not updated yet)
• cargo (submodule updated in Update Clippy and cargo #67661)
• rustfmt (submodule not updated yet)

Once this is done the code in src/libsyntax/attr.rs that allows issue = "0" can be updated.

See #67480 (comment)

[sugar700]

All those submodules merged the change.

[JohnTitor]

I think submodules don't actually block the work, we can move on. Nvm, updating stdarch is actually needed.