slapos_cloud: improve timestamp precision

master/bt5/slapos_cloud/CatalogMethodTemplateItem/portal_catalog/erp5_mysql_innodb/z_create_catalog.sql

@@ -43,7 +43,7 @@ CREATE TABLE `catalog` (
   `has_cell_content` bool,
   `creation_date` datetime,
   `modification_date` datetime,
-  `indexation_timestamp` TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  `indexation_timestamp` TIMESTAMP(6) DEFAULT CURRENT_TIMESTAMP(6) ON UPDATE CURRENT_TIMESTAMP(6),
   PRIMARY KEY  (`uid`),
   KEY `security_uid` (`security_uid`),
   KEY `group_security_uid` (`group_security_uid`),