Fix require path for smoke test
What does this MR do and why?
Fixes broken master: https://gitlab.com/gitlab-org/ruby/gems/gitlab-styles/-/jobs/6812830883
/cc @nao.hashizume
Edited by Thong Kuah
Fixes broken master: https://gitlab.com/gitlab-org/ruby/gems/gitlab-styles/-/jobs/6812830883
/cc @nao.hashizume