Fix OpenStruct use in connection_generic_keyset

.rubocop_manual_todo.yml

@@ -2593,7 +2593,6 @@ Style/OpenStructUse:
     - 'spec/lib/gitlab/database/migrations/runner_spec.rb'
     - 'spec/lib/gitlab/gitaly_client/blobs_stitcher_spec.rb'
     - 'spec/lib/gitlab/gitaly_client/diff_stitcher_spec.rb'
-    - 'spec/lib/gitlab/graphql/pagination/keyset/connection_generic_keyset_spec.rb'
     - '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/graphql/pagination/keyset/connection_generic_keyset_spec.rb

@@ -9,7 +9,7 @@ RSpec.describe Gitlab::Graphql::Pagination::Keyset::Connection do
   let(:arguments) { {} }
   let(:query_type) { GraphQL::ObjectType.new }
   let(:schema) { GraphQL::Schema.define(query: query_type, mutation: nil)}
-  let(:context) { GraphQL::Query::Context.new(query: OpenStruct.new(schema: schema), values: nil, object: nil) }
+  let(:context) { GraphQL::Query::Context.new(query: double('query', schema: schema), values: nil, object: nil) }
 
   let_it_be(:column_order_id) { Gitlab::Pagination::Keyset::ColumnOrderDefinition.new(attribute_name: 'id', order_expression: Project.arel_table[:id].asc) }
   let_it_be(:column_order_id_desc) { Gitlab::Pagination::Keyset::ColumnOrderDefinition.new(attribute_name: 'id', order_expression: Project.arel_table[:id].desc) }