Fix Lint/ConstantDefinitionInBlock cop (#24763)

spec/controllers/concerns/accountable_concern_spec.rb

@@ -3,18 +3,20 @@
 require 'rails_helper'
 
 RSpec.describe AccountableConcern do
-  class Hoge
-    include AccountableConcern
-    attr_reader :current_account
+  let(:hoge_class) do
+    Class.new do
+      include AccountableConcern
+      attr_reader :current_account
 
-    def initialize(current_account)
-      @current_account = current_account
+      def initialize(current_account)
+        @current_account = current_account
+      end
     end
   end
 
   let(:user)   { Fabricate(:account) }
   let(:target) { Fabricate(:account) }
-  let(:hoge)   { Hoge.new(user) }
+  let(:hoge)   { hoge_class.new(user) }
 
   describe '#log_action' do
     it 'creates Admin::ActionLog' do