MainWP Dashboard 5.4.0.21

Fixed: Resolved database table creation issues for wp_mainwp_wp and wp_mainwp_api_keys on installations running PHP 8.4. (#827)

Fixed: Eliminated multiple "Undefined array key" PHP warnings that occurred on fresh WordPress installations running PHP 8.4.

Updated: Changed mShot API base URL from s0.wordpress.com to s0.wp.com to eliminate unnecessary redirections and improve screenshot generation performance.