v4.4.0: Release 4.4.0

Technical improvements release focused on code quality and reliability:

🔧 Technical Improvements:
- Removed requests dependency, replaced with custom HTTP implementation
- Fixed exception naming to follow Python conventions
- Added comprehensive HTTP module tests (coverage 82% → 85%)
- Complete test coverage for network error handling
- Fixed all pyright typing errors for better type safety
- Added Django 6.0 support to testing matrix

This release enhances the robustness and maintainability of the codebase
while removing external dependencies and improving error handling.