Bump appbundler to 0.13.1
Bump appbundler to 0.13.1

This pull request was triggered automatically via Expeditor when appbundler 0.13.1 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