`rustfmt` no longer builds after rust-lang/rust#79336

[rust-highfive]

Hello, this is your friendly neighborhood mergebot.
After merging PR #79336, I observed that the tool rustfmt no longer builds.
A follow-up PR to the repository https://github.com/rust-lang/rustfmt is needed to fix the fallout.

cc @camelid, do you think you would have time to do the follow-up work?
If so, that would be great!

[camelid]

Huh, how did this PR break rustfmt? ripgrep doesn't show any use of optin_builtin_traits, and it compiled fine locally.

[camelid]

Do I need to wait until there's a nightly with the changes or something?

[camelid]

I think this is the same problem as in #79406. I think this might be a little too beyond my understanding of how to fix for now, so I'm unassigning myself.

[calebcartwright]

@camelid - rustfmt leverages the internal rustc mods via the auto publish crates process since rustfmt itself is also published to crates.io. As such the version of those rustc mods used within the rustfmt dep tree tend to lag at least a few weeks behind and in broken toolstate cases like this the fix almost always entails updating those crate versions and dealing with all the subsequent fall out of rustc changes within the rustfmt codebase.

I was already in the process of working on such a bump of those crates, so will hopefully have a fix out before too long (though there were some breaking changes in the parser I need to dig into first)