chore: upgrade go 1.20 -> 1.23.1, remove redundant import aliases

[sheikhrachel]

Purpose

• Removes redundant import aliases for colorful and ciede2000 that can be referenced from the import path
• Updates the project's Go version to 1.23.1
  • recent release notes for reference:
    • 1.21
    • 1.22
    • 1.23

[sheikhrachel]

I've run the test suite locally to confirm continued expected behaviors after the minor version upgrade

Additionally, the current GHA workflows already leverage a go 1.23.x version when running their tasks

[sheikhrachel]

bump on this 🙏