build(deps): bump rand from 0.8.5 to 0.9.3

Bumps [rand](https://github.com/rust-random/rand) from 0.8.5 to 0.9.3.
- [Release notes](https://github.com/rust-random/rand/releases)
- [Changelog](https://github.com/rust-random/rand/blob/0.9.3/CHANGELOG.md)
- [Commits](rust-random/rand@0.8.5...0.9.3)

---
updated-dependencies:
- dependency-name: rand
  dependency-version: 0.9.3
  dependency-type: direct:production
...

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

Author: dependabot[bot]

Cargo.lock

@@ -40,7 +40,7 @@ check-load-addr = ["mcuboot-sys/check-load-addr"]
 [dependencies]
 byteorder = "1.4"
 libc = "0.2"
-rand = { version = "0.8", features = ["small_rng"] }
+rand = { version = "0.9", features = ["small_rng"] }
 docopt = "1.1.0"
 serde = "1.0"
 serde_derive = "1.0"