DEV: remap all core icons for fontawesome 6 upgrade (#28715)

Followup to 7d8974d02f7360b324b446868463e950fe92883f

Co-authored-by: David Taylor <david@taylorhq.com>

plugins/discourse-local-dates/assets/javascripts/initializers/discourse-local-dates.js

@@ -163,7 +163,7 @@ function initializeDiscourseLocalDates(api) {
       title: "discourse_local_dates.title",
       id: "local-dates",
       group: "extras",
-      icon: "calendar-alt",
+      icon: "calendar-days",
       sendAction: (event) =>
         toolbar.context.send("insertDiscourseLocalDate", event),
     });