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](https://github.com/rust-random/rand/compare/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>

Cargo.toml

@@ -12,7 +12,7 @@ repository = "https://github.com/valknarthing/piglet"
 clap = { version = "4.4", features = ["derive", "cargo"] }
 
 # Color handling
-csscolorparser = "0.8"
+csscolorparser = "0.6"
 palette = "0.7"
 
 # Animation & Interpolation
@@ -38,7 +38,7 @@ thiserror = "1.0"
 # Utilities
 itertools = "0.12"
 lazy_static = "1.4"
-rand = "0.8"
+rand = "0.9"
 
 [dev-dependencies]
 pretty_assertions = "1.4"