chore(deps): bump rand from 0.8.6 to 0.9.4

Bumps [rand](https://github.com/rust-random/rand) from 0.8.6 to 0.9.4.
- [Release notes](https://github.com/rust-random/rand/releases)
- [Changelog](https://github.com/rust-random/rand/blob/0.9.4/CHANGELOG.md)
- [Commits](rust-random/rand@0.8.6...0.9.4)

---
updated-dependencies:
- dependency-name: rand
  dependency-version: 0.9.4
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Cargo.lock

@@ -73,7 +73,7 @@ ciborium = { version = "0.2", optional = true }
 chrono = { version = "0.4", features = ["serde"] }
 
 # Random number generation (for resilience jitter)
-rand = "0.8"
+rand = "0.9"
 
 # Temporary files (used by prover backends to invoke external solvers)
 tempfile = "3"