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

@@ -33,7 +33,7 @@ bt_bencode = { version = "0.8", default-features = false }
 bytes = { version = "1.1", default-features = false }
 crc32c = "0.6"
 gen_value = { version = "0.7", default-features = false }
-rand = { version = "0.8", default-features = false }
+rand = { version = "0.9", default-features = false }
 serde = { version = "1.0", default-features = false }
 serde_bytes = { version = "0.11", default-features = false }
 serde_derive = { version = "1.0" }