Fix a minor mistake calling progress.update (should be `completed`).

See !81 (comment 147251)
3 jobs for topic/default/fig-progress-update in 9 minutes and 44 seconds (queued for 1 second)
Status Name Job ID Coverage
  Test
passed step_pythran_cython #133172

00:09:44

passed step_pythran_then_cython #133171

00:07:43

passed step_without_pythran #133170

00:04:55