build(deps): update rand requirement from 0.8 to 0.9

Updates the requirements on [rand](https://github.com/rust-random/rand) to permit the latest version.
- [Release notes](https://github.com/rust-random/rand/releases)
- [Changelog](https://github.com/rust-random/rand/blob/master/CHANGELOG.md)
- [Commits](rust-random/rand@0.8.0...0.9.0)

---
updated-dependencies:
- dependency-name: rand
  dependency-type: direct:production
...

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

ciborium/Cargo.toml

@@ -28,7 +28,7 @@ serde = { version = "1.0.170", default-features = false, features = ["alloc", "d
 [dev-dependencies]
 serde_bytes = "0.11"
 rstest = "0.24.0"
-rand = "0.8"
+rand = "0.9"
 hex = "0.4"
 
 [features]