[meta] update rustfmt style_edition #7591
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Lots of improvements in this edition -- see
https://doc.rust-lang.org/nightly/edition-guide/rust-2024/rustfmt-formatting-fixes.html.
This is a pretty major change that will almost certainly cause conflicts. But it also seems to be one that's necessary, and hard to stage.
I had to run
cargo fmt
twice to reach a fixpoint -- that's quite strange.