ci: Use Cargo build.warnings instead of RUSTFLAGS=-Dwarnings - #44
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[`build.warnings`](https://doc.rust-lang.org/cargo/reference/config.html#buildwarnings) is stable since Rust 1.97.0 and allows controlling rustc and clippy warnings (previously `RUSTFLAGS=-Dwarnings`) as well as rustdoc warnings (previously `RUSTDOCFLAGS=-Dwarnings`) and the new Cargo warnings.
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build.warningsis stable since Rust 1.97.0 and allows controlling rustc and clippy warnings (previouslyRUSTFLAGS=-Dwarnings) as well as rustdoc warnings (previouslyRUSTDOCFLAGS=-Dwarnings) and the new Cargo warnings.