Bump chef version to 11.12.8.
Bump chef version to 11.12.8.

rxrc/bsdznc,ourtownrentals/chef-server-solo,makenew/chef-cookbook,opscafe/data,makenew/chef-cookbook,opscafe/core,opscafe/data,ourtownrentals/chef-supermarket-solo,ourtownrentals/chef-php-modules,makenew/chef-cookbook,rxrc/bsdznc,opscafe/core,ourtownrentals/chef-php-modules,ourtownrentals/chef-supermarket-solo,ourtownrentals/chef-server-solo