Puppet agent 1.10.12 is a bug-fix release that includes updates for Puppet 4.10.11, Facter 3.6.10, Hiera 3.3.3 (which contains no user-facing changes), and pxp-agent 1.5.7. It also contains updates to curl and fixes for Ruby security issues. For details, see https://puppet.com/docs/puppet/4.10/release_notes_agent.html
There was no public Puppet agent 1.10.11 release.