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] <support@github.com>

Cargo.toml

@@ -29,7 +29,7 @@ criterion = "0.5"
 lazy_static = "1.4"
 proptest = "1.0"
 rand = "0.8"
-rand_chacha = "0.3"
+rand_chacha = "0.9"
 serde_json = "1.0"
 
 [features]