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...0.8.5)

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

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

Cargo.toml

@@ -36,7 +36,7 @@ futures = "0.3.4"
 futures-util = "0.3.4"
 thiserror = "1.0"
 bytes = "1.0"
-rand = "0.8"
+rand = "0.9"
 sha-1 = "0.10"
 base64 = "0.22"
 httparse = "1.4.1"