Auto merge of #112038 - Nemo157:edition-2024-unsafe_op_in_unsafe_fn, …

…r=RalfJung

Change `unsafe_op_in_unsafe_fn` to be `warn`-by-default from edition 2024

This was previously FCPed: rust-lang/rust#71668 (comment)

There were two blocking requirements:
* Fix the `unused_unsafe` lint, done in rust-lang/rust#100081
* Have `cargo fix` able to fix the lint, done in rust-lang/rust#112017