chore: Retract v2.0.0 in go.mod due to versioning error

[jferrl]

Description

Added a retraction for v2.0.0 in go.mod with a comment explaining the versioning error. Users are directed to use v1.x.x instead.

Type of Change

Please delete options that are not relevant.

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📚 Documentation update
• 🎨 Code style/refactoring (no functional changes)
• 🔧 Chore (dependency updates, tooling, etc.)

Testing

• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have tested this change manually

Documentation

• I have updated the documentation accordingly
• I have updated the CHANGELOG.md file
• I have added/updated code comments where necessary

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• My changes generate no new warnings
• I have checked my code and corrected any misspellings
• My changes are compatible with the supported Go versions (1.21+)

Related Issues

#23