Fix loading outdated FileSet causing flakiness

Fixed at Samvera Conenct 2023!

Co-authored-by: Brad Watson <brad.watson.orlando@gmail.com>
Co-authored-by: tamsin woo <tomjohnson@ucsb.edu>
Co-authored-by: Adam Ploshay <aploshay@iu.edu>
Co-authored-by: Chris Bartos <topher.bartos@gmail.com>
Co-authored-by: Jen Whitney <jen.j.whitney@gmail.com>

spec/wings/model_transformer_spec.rb

@@ -177,7 +177,7 @@ class Book < Hyrax::Resource
     end
 
     context 'with files and derivatives in fileset' do
-      let(:file_set)            { Hydra::Works::FileSet.new }
+      let(:file_set)            { FileSet.new }
       let(:original_file)       { File.open(File.join(fixture_path, 'world.png')) }
       let(:thumbnail_file)      { File.open(File.join(fixture_path, 'image.jpg')) }
       let(:extracted_text_file) { File.open(File.join(fixture_path, 'updated-file.txt')) }