docs: make banner persist until 11/8 (angular#52432)

PR Close angular#52432

Author: twerske

aio/src/app/app.component.html

@@ -11,7 +11,7 @@
 <header>
   <mat-toolbar #appToolbar color="primary" class="app-toolbar no-print" [class.transitioning]="isTransitioning">
     <mat-toolbar-row class="notification-container">
-      <aio-notification notificationId="angular-event" expirationDate="2023-11-08" [dismissOnContentClick]="true" (dismissed)="notificationDismissed()">
+      <aio-notification notificationId="angular-event" expirationDate="2023-11-08" [dismissOnContentClick]="false" (dismissed)="notificationDismissed()">
         <a href="https://goo.gle/angular-event">
           <mat-icon class="icon" svgIcon="insert_comment" aria-label="Announcement"></mat-icon>
           <span class="message">We have a lot to share, tune in on November 6th!</span>