build(deps): update rand requirement from 0.8.5 to 0.9.0

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@0.8.5...0.9.0)

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

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

Author: dependabot[bot]

Cargo.toml

@@ -30,7 +30,7 @@ libp2p-identity = { version = "0.2.9", features = ["peerid"] }
 [dev-dependencies]
 bincode = "1"
 quickcheck = { version = "1.0.3", default-features = false }
-rand = "0.8.5"
+rand = "0.9.0"
 serde_json = "1.0"
 
 # Passing arguments to the docsrs builder in order to properly document cfg's.