Autofix Rubocop RSpec/LeadingSubject (#23670)

spec/services/follow_service_spec.rb

@@ -1,10 +1,10 @@
 require 'rails_helper'
 
 RSpec.describe FollowService, type: :service do
-  let(:sender) { Fabricate(:account, username: 'alice') }
-
   subject { FollowService.new }
 
+  let(:sender) { Fabricate(:account, username: 'alice') }
+
   context 'local account' do
     describe 'locked account' do
       let(:bob) { Fabricate(:account, locked: true, username: 'bob') }