It looks like your site has tried to update from 5.4 to 5.5 but failed, and you’re left with a mix of the two versions that doesn’t work.
- in 5.4, wp-settings line 70 called
wp_unregister_GLOBALS()which was defined in wp-includes/load.php, loaded from wp-settings line 34 - in 5.5,
wp_unregister_GLOBALShas been deprecated and a placeholder is defined in wp-includes/deprecated.php, which is loaded further down wp-settings.
So you’ve probably somehow ended up with 5.4’s wp-settings.php but 5.5’s wp-includes.
You can fix this by manually completing the WordPress Core upgrade. Back up your site first just in case, then follow the manual upgrade instructions in the WordPress manual: essentially replace all of the WordPress files with a fresh copy but leaving wp-config.php and wp-content/ alone.