Fix activity being rendered within activity due to caching (#11271)

Fix #11270

app/serializers/activitypub/activity_serializer.rb

 # frozen_string_literal: true
 
 class ActivityPub::ActivitySerializer < ActivityPub::Serializer
-  cache key: 'activity', expires_in: 3.minutes
-
   attributes :id, :type, :actor, :published, :to, :cc
 
   has_one :proper, key: :object, serializer: ActivityPub::NoteSerializer, if: :serialize_object?

app/serializers/activitypub/actor_serializer.rb

@@ -3,8 +3,6 @@
 class ActivityPub::ActorSerializer < ActivityPub::Serializer
   include RoutingHelper
 
-  cache key: 'actor', expires_in: 3.minutes
-
   context :security
 
   context_extensions :manually_approves_followers, :featured, :also_known_as,

app/serializers/activitypub/collection_serializer.rb

@@ -7,8 +7,6 @@ class ActivityPub::CollectionSerializer < ActivityPub::Serializer
     super
   end
 
-  cache key: 'collection', expires_in: 3.minutes
-
   attribute :id, if: -> { object.id.present? }
   attribute :type
   attribute :total_items, if: -> { object.size.present? }

app/serializers/activitypub/emoji_serializer.rb

@@ -3,8 +3,6 @@
 class ActivityPub::EmojiSerializer < ActivityPub::Serializer
   include RoutingHelper
 
-  cache key: 'emoji', expires_in: 3.minutes
-
   context_extensions :emoji
 
   attributes :id, :type, :name, :updated

app/serializers/activitypub/note_serializer.rb

 # frozen_string_literal: true
 
 class ActivityPub::NoteSerializer < ActivityPub::Serializer
-  cache key: 'note', expires_in: 3.minutes
-
   context_extensions :atom_uri, :conversation, :sensitive,
                      :hashtag, :emoji, :focal_point, :blurhash