Last test fixes multiple artifacts

spec/requests/api/runner_spec.rb

@@ -1131,7 +1131,7 @@ describe API::Runner do
             # by configuring this path we allow to pass file from @tmpdir only
             # but all temporary files are stored in system tmp directory
             @tmpdir = Dir.mktmpdir
-            allow(ArtifactUploader).to receive(:artifacts_upload_path).and_return(@tmpdir)
+            allow(JobArtifactUploader).to receive(:artifacts_upload_path).and_return(@tmpdir)
           end
 
           after do

spec/tasks/gitlab/backup_rake_spec.rb

@@ -24,7 +24,6 @@ describe 'gitlab:app namespace rake task' do
 
     # We need this directory to run `gitlab:backup:create` task
     FileUtils.mkdir_p('public/uploads')
-    FileUtils.mkdir_p(Rails.root.join('tmp/tests/artifacts'))
   end
 
   before do