(FACT-2390) Update facter submodule to f81a7066c98e2c47e0f9f9f17b709ccf34cbf52e
(FACT-2390) Update facter submodule to f81a7066c98e2c47e0f9f9f17b709ccf34cbf52e

This update fixes an issue where recusion checking when resolving facts
was not threadsafe.

puppetlabs/puppetserver,puppetlabs/puppetserver,puppetlabs/puppet-server,puppetlabs/puppetserver,puppetlabs/puppetserver,puppetlabs/puppet-server,puppetlabs/puppet-server