Fix deprecation warnings

As per https://forge.puppetlabs.com/puppetlabs/apt key and key_content
are deprecated

Author: Patrick Robinson

manifests/repo/puppetlabs.pp

@@ -7,8 +7,10 @@
   if($::osfamily == 'Debian') {
     Apt::Source {
       location    => 'http://apt.puppetlabs.com',
-      key         => '47B320EB4C7C375AA9DAE1A01054B7A24BD6EC30',
-      key_content => template('puppet/pgp.key'),
+      key         => {
+        id      => '47B320EB4C7C375AA9DAE1A01054B7A24BD6EC30',
+        content => template('puppet/pgp.key')
+      },
     }
     apt::source { 'puppetlabs':      repos => 'main' }
     apt::source { 'puppetlabs-deps': repos => 'dependencies' }