DEV: Add api scoping for updating topics. (#16101)

This change adds a new api scope for updating topics.

See: https://meta.discourse.org/t/219805

app/models/api_key_scope.rb

@@ -22,6 +22,7 @@ class ApiKeyScope < ActiveRecord::Base
         },
         topics: {
           write: { actions: %w[posts#create], params: %i[topic_id] },
+          update: { actions: %w[topics#update], params: %i[topic_id] },
           read: {
             actions: %w[topics#show topics#feed topics#posts],
             params: %i[topic_id], aliases: { topic_id: :id }

config/locales/client.en.yml

@@ -4213,6 +4213,7 @@ en:
             topics:
               read: Read a topic or a specific post in it. RSS is also supported.
               write: Create a new topic or post to an existing one.
+              update: Update a topic. Change the title, category, tags, etc.
               read_lists: Read topic lists like top, new, latest, etc. RSS is also supported.
               wordpress: Necessary for the WordPress wp-discourse plugin to work.
             posts: