✨ PHP 8 Support

• SleekDB now requires PHP 8.4 or higher, bringing modern PHP features and improved performance.
• Updated PHPUnit to version 11 for better testing capabilities.

🗑️ Removed deprecated timeout configuration

• The deprecated timeout configuration has been completely removed.
• If you need to set a timeout, use PHP's native set_time_limit() function in your own code.

🌈 Improved type safety

• Updated method signatures to use nullable types for better type safety and PHP 8 compatibility.