Bump mixlib-shellout to 3.0.9
Bump mixlib-shellout to 3.0.9

This pull request was triggered automatically via Expeditor when mixlib-shellout 3.0.9 was promoted to Rubygems.

This change falls under the obvious fix policy so no Developer Certificate of Origin (DCO) sign-off is required.

chef/chef-dk,chef/chef-dk,chef/chef-dk