Adjust PHP version in version compare for driver specific PDO constants

Author: BastianLedererIcinga

library/Icingadb/Common/Backend.php

@@ -62,7 +62,7 @@ public static function getDb(): Connection
             if ($config->db === 'mysql') {
                 // In PHP 8.5+, driver-specific constants of the PDO class are deprecated,
                 // but the replacements are only available since php 8.4
-                if (version_compare(PHP_VERSION, '8.5.0', '<')) {
+                if (version_compare(PHP_VERSION, '8.4.0', '<')) {
                     $mysqlConstantPrefix = 'PDO::MYSQL_ATTR_';
                 } else {
                     $mysqlConstantPrefix = 'Pdo\Mysql::ATTR_';