fix: remove deprecated MYSQLI_TYPE_INTERVAL constant for PHP 8.4+ compatibility.

Author: pocketarc

system/database/drivers/mysqli/mysqli_result.php

@@ -153,7 +153,6 @@ private static function _get_field_type($type)
 			MYSQLI_TYPE_DATETIME    => 'datetime',
 			MYSQLI_TYPE_YEAR        => 'year',
 			MYSQLI_TYPE_NEWDATE     => 'date',
-			MYSQLI_TYPE_INTERVAL    => 'interval',
 			MYSQLI_TYPE_ENUM        => 'enum',
 			MYSQLI_TYPE_SET         => 'set',
 			MYSQLI_TYPE_TINY_BLOB   => 'tinyblob',