chore(deps-rs): bump bytemuck from 1.20.0 to 1.21.0 in the minor group

Bumps the minor group with 1 update: [bytemuck](https://github.com/Lokathor/bytemuck).


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

---
updated-dependencies:
- dependency-name: bytemuck
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Cargo.toml

@@ -44,7 +44,7 @@ itertools = "0.13.0"
 tket-json-rs = "0.7.1"
 tracing = "0.1.37"
 portmatching = "0.3.1"
-bytemuck = "1.20.0"
+bytemuck = "1.21.0"
 cgmath = "0.18.0"
 chrono = "0.4.39"
 clap = "4.5.23"