build(deps): bump bytemuck from 1.20.0 to 1.21.0

[dependabot]

Bumps bytemuck from 1.20.0 to 1.21.0.

Changelog

Sourced from bytemuck's changelog.

bytemuck changelog

1.21

• Implement Pod and Zeroable for core::arch::{x86, x86_64}::__m512, __m512d and __m512i without nightly. Requires Rust 1.72, and is gated through the avx512_simd cargo feature.
• Allow the use of must_cast_mut and must_cast_slice_mut in const contexts. Requires Rust 1.83, and is gated through the must_cast_extra cargo feature.
• internal: introduced the maybe_const_fn macro that allows defining some function to be const depending upon some cfg predicate.

1.20

• New functions to allocate zeroed Arc and Rc. Requires Rust 1.82
• TransparentWrapper impls for core::cmp::Reverse and core::num::Saturating.
• internal: Simplified the library's fill_zeroes calls to write_bytes

1.19

• Adds the #[track_caller] attribute to functions which may panic.

1.18

• Adds the latest_stable_rust cargo feature, which is a blanket feature that turns all other features on that are both sound and compatible with Stable rust.

1.17.1

• Adds #[repr(C)] to the union Transmute<A, B> type that's used internally for most of the transmutations.

1.17.0

• Makes the must_cast versions of the by-value and by-ref casts be const. The mut ref cast is unaffected for now (mut references aren't yet stable in const fn). This increases the MSRV of using that particular feature from 1.57 to 1.64.

1.16.3

• Fully described in Lokathor/bytemuck#256, This makes casting slices to/from ZST elements more consistent between the crate's core module and other modules.

1.16.2

• Fixes potential UB where BoxBytes could attempt to free a dangling pointer if the Layout is zero sized. This type was introduced in 1.14.1, so that version and the others up to and including 1.16.1 are now yanked for safety.

1.16.1

... (truncated)

Commits

• 621848f chore: Release bytemuck version 1.21.0
• 75b54ef changelog
• 45fbae7 chore: Release bytemuck_derive version 1.8.1
• 9d06a93 changelog
• d6c589f Cargo.toml: add transparentwrapper_extra to latest_stable_rust, and expand on...
• 9801bb9 Update lib.rs (#290)
• 4bdaf0a Implements Pod and Zeroable for AVX512 types that don't require nightly. ...
• 227d7fe hide unexpected_cfgs warnings in proc-macro generated code (#287)
• See full diff in compare view

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