build(deps): bump rand from 0.8.5 to 0.9.0

Bumps [rand](https://github.com/rust-random/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: rand
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Cargo.lock

@@ -18,7 +18,7 @@ thiserror = "2.0.9"
 
 [dev-dependencies]
 rand_distr = "0.4.3"
-rand = "0.8"
+rand = "0.9"
 spl-merkle-tree-reference = { version = "0.1.0", path = "../merkle-tree-reference" }
 tokio = { version = "1.42", features = ["full"] }