Fix thread-unsafe ActivityPub activity dispatch (#37423)

app/lib/activitypub/activity.rb

@@ -22,13 +22,13 @@ class ActivityPub::Activity
   class << self
     def factory(json, account, **options)
       @json = json
-      klass&.new(json, account, **options)
+      klass_for(json)&.new(json, account, **options)
     end
 
     private
 
-    def klass
-      case @json['type']
+    def klass_for(json)
+      case json['type']
       when 'Create'
         ActivityPub::Activity::Create
       when 'Announce'