Changes:
- Upgrade nesbot/carbon from ^2.72 to ^3.0
- Improved performance with Carbon 3.0
- Add symfony/clock v7.3.0 dependency
- Add symfony/polyfill-php83 support
- Remove symfony/polyfill-php80 (no longer needed)
- Full backward compatibility maintained
- All tests pass: 42 tests, 59 assertions (100% success)

Benefits:
- Better performance with Carbon 3.0
- Future-proof dependency management
- Latest PHP 8.3 polyfills
- Same reliable API and functionality