Fix CHEF-3964 deprecation warning.
Deprecated features used!
Cloning resource attributes for link[/opt/gitlab/embedded/service/gitlab-rails/.gitlab_shell_secret] from prior resource (CHEF-3694)
Previous link[/opt/gitlab/embedded/service/gitlab-rails/.gitlab_shell_secret]: /opt/gitlab/embedded/cookbooks/cache/cookbooks/gitlab/recipes/gitlab-rails.rb:257:in `from_file'
Current link[/opt/gitlab/embedded/service/gitlab-rails/.gitlab_shell_secret]: /opt/gitlab/embedded/cookbooks/cache/cookbooks/gitlab/definitions/template_symlink.rb:39:in `block in from_file' at 1 location:
- /opt/gitlab/embedded/cookbooks/cache/cookbooks/gitlab/definitions/template_symlink.rb:39:in `block in from_file'