`ref_patterns` is triggered on generated code

### Summary `ref` is sometimes used by proc macros, notably by https://crates.io/crates/parity-scale-codec-derive. Considering the main stated concern of the lint being clarity of the code, it simply doesn't apply to generated code annotated with `#[automatically_derived]` attribute. ### Lint Name ref_patterns ### Reproducer _No response_ ### Version ```text rustc 1.97.0-nightly (20de910db 2026-05-02) binary: rustc commit-hash: 20de910db49d3476ccf49ea79a4b22e2b5dface0 commit-date: 2026-05-02 host: x86_64-unknown-linux-gnu release: 1.97.0-nightly LLVM version: 22.1.4 ``` ### Additional Labels _No response_