Update rand_chacha requirement from 0.3 to 0.9

Updates the requirements on [rand_chacha](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](https://github.com/rust-random/rand/compare/rand_chacha-0.3.0...0.9.0)

---
updated-dependencies:
- dependency-name: rand_chacha
  dependency-version: 0.9.0
  dependency-type: direct:production
...

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

Cargo.toml

@@ -44,7 +44,7 @@ blake3 = "1.3"
 hex = "0.4"
 image = "0.24"
 once_cell = "1.9"
-rand_chacha = "0.3"
+rand_chacha = "0.9"
 sha2 = "0.10"
 sysinfo = "0.29"
 serde = { version = "1", features = ["derive"] }