Update csscolorparser requirement from 0.6 to 0.8

Updates the requirements on [csscolorparser](https://github.com/mazznoer/csscolorparser-rs) to permit the latest version.
- [Release notes](https://github.com/mazznoer/csscolorparser-rs/releases)
- [Changelog](https://github.com/mazznoer/csscolorparser-rs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mazznoer/csscolorparser-rs/compare/v0.6.0...v0.8.0)

---
updated-dependencies:
- dependency-name: csscolorparser
  dependency-version: 0.8.0
  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 = "0.6"
+csscolorparser = "0.8"
 palette = "0.7"
 
 # Animation & Interpolation