rust/keygen(deps): bump rand from 0.8.5 to 0.9.2 in /tools/ssh_keygen

Bumps [rand](https://github.com/rust-random/rand) from 0.8.5 to 0.9.2.
- [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...rand_core-0.9.2)

---
updated-dependencies:
- dependency-name: rand
  dependency-version: 0.9.2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

tools/ssh_keygen/Cargo.lock

@@ -9,7 +9,7 @@ license = "MIT"
 anyhow = "1.0"
 clap = { version = "4.0", features = ["derive"] }
 ssh-key = { version = "0.6", features = ["ed25519", "rsa", "ecdsa", "rand_core"] }
-rand = "0.8"
+rand = "0.9"
 
 [dev-dependencies]
 tempfile = "3.0"