Review comment: re-use style

Co-authored-by: Filip Troníček <[email protected]>

Author: geropl

components/dashboard/src/org-admin/MaintenanceNotificationCard.tsx

@@ -131,7 +131,7 @@ export const MaintenanceNotificationCard: FC = () => {
             </div>
 
             <div className="mt-4">
-                <label className="block text-sm font-semibold text-gray-700 dark:text-gray-300 mb-2">Preview</label>
+                <label className="block text-sm font-semibold text-pk-content-secondary mb-2">Preview</label>
                 <Alert type="warning" className="mb-0">
                     <div className="flex items-center flex-wrap gap-2">
                         <span className="font-semibold">Scheduled Maintenance:</span>