Use be_sorted DSL methods

This uses the new be_sorted DSL methods, which do the same thing, but
are a little more descriptive and robust to changes.

ee/spec/graphql/resolvers/boards/epic_boards_resolvers_spec.rb

@@ -44,7 +44,7 @@ RSpec.describe Resolvers::Boards::EpicBoardsResolver do
         it 'returns epic boards in the group ordered by name' do
           expect(result)
             .to contain_exactly(epic_board2, epic_board1)
-            .and be_sorted(:name, :asc)
+            .and be_sorted.asc.by(&:name)
         end
 
         context 'when epic_boards flag is disabled' do