feat: improve hasTTY detection

[NamesMT]

Context: WSL2 Alpine with zsh

🔗 Linked issue

❓ Type of change

• [ ] 📖 Documentation (updates to the documentation, readme, or JSdoc annotations)
• [x] 🐞 Bug fix (a non-breaking change that fixes an issue)
• [x] 👌 Enhancement (improving an existing functionality like performance)
• [ ] ✨ New feature (a non-breaking change that adds functionality)
• [ ] 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• [ ] ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

I'm using WSL2 Alpine zsh, hasTTY isn't detected so things like isColorSupported is false. From my stdout dump there's a flag: _type='tty' that could be used.

📝 Checklist

• [ ] I have linked an issue or discussion.
• [ ] I have updated the documentation accordingly.

[NamesMT]

Need some re-checking

[NamesMT]

Yup, written this too quickly without actually testing, a new tested and double-checked PR has been created: https://github.com/unjs/std-env/pull/97