Auto merge of #102513 - RalfJung:no-more-unaligned-reference, r=cjgillot,scottmcm
make unaligned_reference a hard error
The `unaligned_references` lint has been warn-by-default since Rust 1.53 (https://github.com/rust-lang/rust/pull/82525) and deny-by-default with mention in cargo future-incompat reports since Rust 1.62 (https://github.com/rust-lang/rust/pull/95372). Current nightly will become Rust 1.66, so (unless major surprises show up with crater) I think it is time we make this a hard error, and close this old soundness gap in the language.
EDIT: Turns out this will only land for Rust 1.67, so there is another 6 weeks of time here for crates to adjust.
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