Fix OpenStruct use

Fixed OpenStruct use in dsl_spec as Ruby 3 discourages it

Changelog: other

.rubocop_manual_todo.yml

@@ -2599,7 +2599,6 @@ Style/OpenStructUse:
     - 'spec/lib/gitlab/graphql/pagination/keyset/connection_spec.rb'
     - 'spec/lib/gitlab/legacy_github_import/project_creator_spec.rb'
     - '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/models/design_management/design_action_spec.rb'
     - 'spec/models/design_management/design_at_version_spec.rb'

spec/lib/gitlab/quick_actions/dsl_spec.rb

@@ -96,8 +96,8 @@ RSpec.describe Gitlab::QuickActions::Dsl do
 
       expect(dynamic_description_def.name).to eq(:dynamic_description)
       expect(dynamic_description_def.aliases).to eq([])
-      expect(dynamic_description_def.to_h(OpenStruct.new(noteable: 'issue'))[:description]).to eq('A dynamic description for ISSUE')
-      expect(dynamic_description_def.execute_message(OpenStruct.new(noteable: 'issue'), 'arg')).to eq('A dynamic execution message for ISSUE passing arg')
+      expect(dynamic_description_def.to_h(double('desc', noteable: 'issue'))[:description]).to eq('A dynamic description for ISSUE')
+      expect(dynamic_description_def.execute_message(double('desc', noteable: 'issue'), 'arg')).to eq('A dynamic execution message for ISSUE passing arg')
       expect(dynamic_description_def.params).to eq(['The first argument', 'The second argument'])
       expect(dynamic_description_def.condition_block).to be_nil
       expect(dynamic_description_def.types).to eq([])