Enable retracted module test

go list -m properly handles retractions so this test is now passing

go_modules/spec/dependabot/go_modules/update_checker/latest_version_finder_spec.rb

@@ -212,7 +212,7 @@ module foobar
       # latest release v1.0.1 is retracted
       let(:dependency_name) { "github.com/dependabot-fixtures/go-modules-retracted" }
 
-      pending "doesn't return the retracted version" do
+      it "doesn't return the retracted version" do
         expect(finder.latest_version).to eq(Dependabot::GoModules::Version.new("1.0.0"))
       end
     end