Update rand requirement from 0.8 to 0.9 in /indy-credx

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...rand_core-0.9.2)

---
updated-dependencies:
- dependency-name: rand
  dependency-version: 0.9.2
  dependency-type: direct:production
...

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

Author: dependabot[bot]

indy-credx/Cargo.toml

@@ -30,7 +30,7 @@ indy-data-types = { version = "0.7.1", features = [
 ], path = "../indy-data-types" }
 log = "0.4"
 once_cell = "1"
-rand = "0.8"
+rand = "0.9"
 regex = "1"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"