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]

juniper_actix/Cargo.toml

@@ -45,7 +45,7 @@ bytes = "1.0"
 env_logger = "0.11"
 juniper = { version = "0.16", path = "../juniper", features = ["expose-test-schema"] }
 log = "0.4"
-rand = "0.8"
+rand = "0.9"
 tokio = "1.0"
 
 [[example]]