Fix Rubocop failure in spec/models/project_spec.rb

spec/models/project_spec.rb

@@ -1727,7 +1727,7 @@ describe Project do
         .and_return(true)
 
       # Works around https://github.com/rspec/rspec-mocks/issues/910
-      expect(Project).to receive(:find).with(project.id).twice.and_return(project)
+      expect(described_class).to receive(:find).with(project.id).twice.and_return(project)
       expect(project.repository).to receive(:after_import)
         .and_call_original
       expect(project.wiki.repository).to receive(:after_import)