build(deps): bump bytemuck from 1.20.0 to 1.21.0 (#34762)

Bumps [bytemuck](https://github.com/Lokathor/bytemuck) from 1.20.0 to 1.21.0.
- [Changelog](https://github.com/Lokathor/bytemuck/blob/main/changelog.md)
- [Commits](https://github.com/Lokathor/bytemuck/compare/v1.20.0...v1.21.0)

---
updated-dependencies:
- dependency-name: bytemuck
  dependency-type: indirect
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.lock

@@ -614,9 +614,9 @@ checksum = "28346c117b50270785fbc123bd6e4ecad20d0c6d5f43d081dc80a3abcc62be64"
 
 [[package]]
 name = "bytemuck"
-version = "1.20.0"
+version = "1.21.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8b37c88a63ffd85d15b406896cc343916d7cf57838a847b3a6f2ca5d39a5695a"
+checksum = "ef657dfab802224e671f5818e9a4935f9b1957ed18e58292690cc39e7a4092a3"
 dependencies = [
  "bytemuck_derive",
 ]