fix: Use the right variable for the auth header.
The header name is wrong in the ci. https://gitlab.com/gitlab-com/runbooks/-/blob/master/scripts/perform-periodic-queries.rb?ref_type=heads#L24
The header name is wrong in the ci. https://gitlab.com/gitlab-com/runbooks/-/blob/master/scripts/perform-periodic-queries.rb?ref_type=heads#L24