Bump the rust-updates group across 1 directory with 3 updates

Bumps the rust-updates group with 3 updates in the / directory: [bytemuck](https://github.com/Lokathor/bytemuck), [proptest](https://github.com/proptest-rs/proptest) and [rand](https://github.com/rust-random/rand).


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)

Updates `proptest` from 1.5.0 to 1.6.0
- [Release notes](https://github.com/proptest-rs/proptest/releases)
- [Changelog](https://github.com/proptest-rs/proptest/blob/main/CHANGELOG.md)
- [Commits](proptest-rs/proptest@v1.5.0...v1.6.0)

Updates `rand` from 0.8.5 to 0.9.0
- [Release notes](https://github.com/rust-random/rand/releases)
- [Changelog](https://github.com/rust-random/rand/blob/master/CHANGELOG.md)
- [Commits](rust-random/rand@0.8.5...0.9.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Cargo.lock

@@ -6,14 +6,14 @@ edition = "2021"
 rust-version = "1.81"
 
 [dependencies]
-bytemuck = { version = "1.20.0", features = ["derive"] }
+bytemuck = { version = "1.21.0", features = ["derive"] }
 enum-map = "2.7.3"
-proptest = "1.4.0"
+proptest = "1.6.0"
 # scoped_threadpool = { version = "0.1.9" }
-rand = "0.8.5"
+rand = "0.9.0"
 
 [dev-dependencies]
-rand = "0.8.5"
+rand = "0.9.0"
 
 [lints.rust]
 unsafe_code = "forbid"