Add haml_lint to development gems list
The automatic update would have picked up https://github.com/sds/haml-lint/pull/413 and avoided a confusing error in https://gitlab.com/gitlab-org/gitlab/-/jobs/5708107258.
The automatic update would have picked up https://github.com/sds/haml-lint/pull/413 and avoided a confusing error in https://gitlab.com/gitlab-org/gitlab/-/jobs/5708107258.