Update rand requirement from 0.8.5 to 0.9.0

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@0.8.5...0.9.0)

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

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

Cargo.toml

@@ -40,7 +40,7 @@ pharmsol = "0.7.2"
 # pharmsol = {path="../pharmsol"}
 # pharmsol = { git = "https://github.com/LAPKB/pharmsol.git", branch = "dev"}
 toml = "0.8.14" #REMOVE
-rand = "0.8.5"
+rand = "0.9.0"
 anyhow = "1.0.86"
 nalgebra = "0.33.0"