- Update PHP requirement to ^8.3
- Upgrade laravel/framework to ^13.0 and laravel/tinker to ^3.0
- Upgrade pestphp/pest to ^4.0 and pest-plugin-laravel to ^4.0
- Update spatie/laravel-csp to ^3.23 and barryvdh/laravel-debugbar to ^4.1
- Add session serialization config option (defaults to 'json')
- Add FlasherSessionTest to verify flasher works with JSON sessions