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Auto merge of #120092 - zetanumbers:pin_in_static_allocator, r=Amanieu
Add `A: 'static` bound for `Arc/Rc::pin_in`
Analogous to https://github.com/rust-lang/rust/pull/79327
Needed to preserve pin's [drop guarantee](https://doc.rust-lang.org/std/pin/index.html#drop-guarantee)
