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](rust-random/rand@rand_chacha-0.3.0...0.9.0)

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

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

Cargo.toml

@@ -42,7 +42,7 @@ log = "0.4"
 num-traits = "0.2"
 quick-error = "2"
 rand = "0.8"
-rand_chacha = "0.3"
+rand_chacha = "0.9"
 sha2 = "0.10"
 
 [dev-dependencies]