[ci] fix typo: Update .gitlab-ci.yml

Found errors in your .gitlab-ci.yml:

  • Remote file `https://xgitlab.cels.anl.gov/argo/argopkgs/raw/mastergitlab-ci/argonix.yml` could not be fetched because of HTTP code `404` error!
You can also test your .gitlab-ci.yml in CI Lint