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>

Author: dependabot[bot]

pictor/Cargo.toml

@@ -14,7 +14,7 @@ decorum = "^0.4.0"
 naga = "^23.0.0"
 nalgebra = "^0.33.0"
 num = "^0.4.3"
-rand = "^0.8.5"
+rand = "^0.9.0"
 theon = "^0.1.0"
 winit = "^0.30.8"