puppet throws numerous ruby warnings on Focal

[Neil Wilson]

The puppet 5.5 version available in Focal throws a lot of ruby warnings, which interferes with the puppet installation traces.

remote: /usr/lib/ruby/vendor_ruby/puppet/util.rb:461: warning: URI.escape is obsolete
remote: /usr/lib/ruby/vendor_ruby/puppet/file_system/uniquefile.rb:126: warning: $SAFE will become a normal global variable in Ruby 3.0
remote: /usr/lib/ruby/vendor_ruby/puppet/util.rb:315: warning: deprecated Object#=~ is called on Puppet::Transaction::Report; it always returns nil
emote: /usr/lib/ruby/vendor_ruby/puppet/type/cron.rb:160: warning: deprecated Object#=~ is called on Integer; it always returns nil

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: puppet 5.5.10-4ubuntu3
ProcVersionSignature: User Name 5.4.0-62.70-generic 5.4.78
Uname: Linux 5.4.0-62-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.14
Architecture: amd64
CasperMD5CheckResult: skip
Date: Wed Jan 27 17:11:14 2021
PackageArchitecture: all
SourcePackage: puppet
UpgradeStatus: No upgrade log present (probably fresh install)