fix: fail-fast is a flag and not an option (does not accept a value)

[alex-sandri]

Description

--fail-fast is a flag and not an option and as such does not accept any value.

Example

This config is currently broken as in the generated command --fail-fast true is not valid syntax.

scripts:
  lint:
    run: flutter analyze
    exec:
      failFast: true
      concurrency: 1

Type of Change

• [ ] ✨ feat -- New feature (non-breaking change which adds functionality)
• [x] 🛠️ fix -- Bug fix (non-breaking change which fixes an issue)
• [ ] ❌ ! -- Breaking change (fix or feature that would cause existing functionality to change)
• [ ] 🧹 refactor -- Code refactor
• [ ] ✅ ci -- Build configuration change
• [ ] 📝 docs -- Documentation
• [ ] 🗑️ chore -- Chore

[CLAassistant]

All committers have signed the CLA.

[blaugold]

Good catch! Thank you.