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feat(rustdoc): `--emit=depinfo` output to stdout via `-` rustdoc's `--emit=depinfo` flag now supports using `-` to write the output to stdout, aligning with rustc's behavior. This will fix <https://github.com/rust-lang/rust/issues/147649>. ### How to review * The first commit demonstrates that `rustdoc --emit=depinfo=-` hasn't yet supported emitting to stdout. * The second implements it and the diff shows how the behavior changes.