Change the wraith gem installations to `latest`
Change the wraith gem installations to `latest`

The original problem was that the `rake` installation is
somehow incomplete.  The suggestion at https://askubuntu.com/a/874551
to run the install from command line does repair the installation.

However, apparently the Ansible `gem` module won't reinstall
existing gems in the same way that `gem` does when run from
the command line.

Changing `state` to `latest` does (currently) result in a correct
`rake` installation.

kentr/drupal-vm,kentr/drupal-vm,kentr/drupal-vm,kentr/drupal-vm,kentr/drupal-vm