fix: update notification media query breakpoint to 450px (#12184) (#12190)

Co-authored-by: Knoobie <Knoobie@gmx.de>

Author: vaadin-bot

packages/vaadin-lumo-styles/src/components/notification-container.css

@@ -39,7 +39,7 @@
     flex: 1 1 0%;
   }
 
-  @media (max-width: 420px) {
+  @media (max-width: 450px) {
     [region-group] {
       flex-direction: column;
       align-items: stretch;