Bump upper version of puppetlabs-apt
Bump upper version of puppetlabs-apt

Now we are using puppetlabs-apt v8.4.1 in our CI. Let's bump the upper
version so that the constraint include that tested version.

Change-Id: I3f51e95d0dd891b70be461e120d58cd32afa192c

openstack/puppet-ceph,openstack/puppet-ceph