[sensu] bumped the default version of sensu to 0.12.3-1
[sensu] bumped the default version of sensu to 0.12.3-1

klamontagne/sensu-chef,cwjohnston/sensu-chef,klamontagne/sensu-chef,cwjohnston/sensu-chef,sensu/sensu-chef,sensu/sensu-chef,sh88/chef-repo,sh88/chef-repo