Merge pull request #1457 from puppetlabs/pdksync_GH-iac-334/main/remove_ubuntu_16.04_support

pdksync - (GH-iac-334) Remove Support for Ubuntu 16.04

Author: LukasAud

metadata.json

@@ -61,7 +61,6 @@
     {
       "operatingsystem": "Ubuntu",
       "operatingsystemrelease": [
-        "16.04",
         "18.04",
         "20.04"
       ]