Fix OpenStruct usage

Fixes OpenStruct use in usage_data_spec since Ruby 3 discourages it

Changelog: changed

.rubocop_manual_todo.yml

@@ -2615,7 +2615,6 @@ Style/OpenStructUse:
     - 'spec/lib/gitlab/quick_actions/command_definition_spec.rb'
     - 'spec/lib/gitlab/quick_actions/dsl_spec.rb'
     - 'spec/lib/gitlab/relative_positioning/range_spec.rb'
-    - 'spec/lib/gitlab/usage_data_spec.rb'
     - 'spec/models/design_management/design_action_spec.rb'
     - 'spec/models/design_management/design_at_version_spec.rb'
     - 'spec/models/user_spec.rb'

spec/lib/gitlab/usage_data_spec.rb

@@ -375,9 +375,9 @@ RSpec.describe Gitlab::UsageData, :aggregate_failures do
 
     def omniauth_providers
       [
-        OpenStruct.new(name: 'google_oauth2'),
-        OpenStruct.new(name: 'ldapmain'),
-        OpenStruct.new(name: 'group_saml')
+        double('provider', name: 'google_oauth2'),
+        double('provider', name: 'ldapmain'),
+        double('provider', name: 'group_saml')
       ]
     end
   end