Bump chef-apply to 0.9.4 (#2947)

This pull request was triggered automatically via Expeditor when chef-apply 0.9.4 was promoted to Rubygems.

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

Co-authored-by: Chef Expeditor <chef-ci@chef.io>
Co-authored-by: Vikram Karve <85881329+vkarve-chef@users.noreply.github.com>