feat: switch to pipx & add github-token

[DariuszPorowski]

💌 Description

• switch to pipx for deps install
• deprecate token in favor of github-token
• prep for v2

🔗 Related issue

Fixes: #21

🏗️ Type of change

• [ ] 📚 Examples/docs/tutorials
• [ ] 🐛 Bug fix (non-breaking change which fixes an issue)
• [ ] 🥂 Improvement (non-breaking change which improves an existing feature)
• [ ] 🚀 New feature (non-breaking change which adds functionality)
• [ ] 💥 Breaking change (fix or feature that would cause existing functionality to change)
• [ ] 🚨 Security fix
• [ ] ⬆️ Dependencies update

✅ Checklist

• [ ] I've read the Code of Conduct document.
• [ ] I've read the Contributing guide.