Sdk 2648 python sdk update protobuf library and dependants

[mehmet-yoti]

Update protobuf to 4.21.12 and modernize Python version support

📋 Summary

This PR updates the protobuf library from 3.20.1 to 4.21.12 and modernizes the Python version support to align with current best practices and security requirements.

🔄 Changes Made

Core Dependencies

• Protobuf: Updated from 3.20.1 → 4.21.12
• Python Requirements: Added python_requires=">=3.7"

Python Version Support

• ❌ Removed support for: Python 2.7, 3.4, 3.5, 3.6
• ✅ Added support for: Python 3.7, 3.8, 3.9, 3.10, 3.11, 3.12

Files Modified

• setup.py: Updated protobuf version, Python classifiers, and added python_requires
• requirements.txt: Regenerated with new protobuf version using pip-compile

🚨 Breaking Changes

⚠️ This is a breaking change release

1. Minimum Python Version: Now requires Python 3.7+

   • Previously supported Python 2.7 and Python 3.4+
   • Applications using older Python versions will need to upgrade

2. Protobuf Major Version: Upgraded from 3.x to 4.x

   • Generally backward compatible, but may have subtle differences
   • Generated protobuf files may need regeneration for optimal compatibility

🔍 Technical Details

Protobuf 4.21.12 Benefits

• Improved performance and memory usage
• Better Python 3.7+ integration
• Enhanced security and bug fixes
• Continued support and maintenance

Python Version Modernization

• Drops legacy Python 2.7 support
• Aligns with current Python support lifecycle
• Enables use of modern Python features
• Improves security posture

⚠️ Important Notes

Generated Protobuf Files

The existing protobuf generated files (*_pb2.py) in yoti_python_sdk/protobuf/ contain older patterns like:

_b=sys.version_info[0]<3 and (lambda x:x) or (lambda x:x.encode('latin1'))