Fix some flaky tests that randomly failed because of item ordering (#17509)

spec/controllers/activitypub/followers_synchronizations_controller_spec.rb

@@ -47,7 +47,7 @@ RSpec.describe ActivityPub::FollowersSynchronizationsController, type: :controll
 
       it 'returns orderedItems with followers from example.com' do
         expect(body[:orderedItems]).to be_an Array
-        expect(body[:orderedItems].sort).to eq [follower_4.uri, follower_1.uri, follower_2.uri]
+        expect(body[:orderedItems]).to match_array([follower_4.uri, follower_1.uri, follower_2.uri])
       end
 
       it 'returns private Cache-Control header' do