Fix `FetchFeaturedCollectionService` spec (#19401)

Regression from #19380

app/services/activitypub/fetch_featured_collection_service.rb

@@ -43,8 +43,7 @@ class ActivityPub::FetchFeaturedCollectionService < BaseService
 
   def process_note_items(items)
     status_ids = items.filter_map do |item|
-      type = item['type']
-      next unless type == 'Note'
+      next unless item.is_a?(String) || item['type'] == 'Note'
 
       uri = value_or_id(item)
       next if ActivityPub::TagManager.instance.local_uri?(uri)

spec/services/activitypub/fetch_featured_collection_service_spec.rb

@@ -65,7 +65,7 @@ RSpec.describe ActivityPub::FetchFeaturedCollectionService, type: :service do
       stub_request(:get, 'https://example.com/account/pinned/3').to_return(status: 404)
       stub_request(:get, 'https://example.com/account/pinned/4').to_return(status: 200, body: Oj.dump(status_json_4))
 
-      subject.call(actor)
+      subject.call(actor, note: true, hashtag: false)
     end
 
     it 'sets expected posts as pinned posts' do