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] <[email protected]>

Author: dependabot[bot]

Cargo.toml

@@ -31,7 +31,7 @@ polling = "2.8.0"
 educe = "0.6.0"
 
 libc = "0.2"
-rand = "0.8"
+rand = "0.9"
 st3 = "0.4"
 crossbeam-deque = "0.8"
 time = "0.3"