[PUP-10247] Support ruby 2.7 - Puppet Jira Server

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puppet specs fail on ruby 2.7.0 because:

sync was extracted into a different gem. But we don't actually need that code, so remove the require 'sync' statements.
scanf was extracted into a different gem. We need to add a runtime dependency on that gem ~> 1.0 to puppet's .gemspec. We will need to update a few other projects first (puppetserver, r10k, etc) first.
There many ruby deprecation warnings due to keyword argument vs positional argument handling. See https://www.ruby-lang.org/en/news/2019/12/12/separation-of-positional-and-keyword-arguments-in-ruby-3-0/

is duplicated by

PUP-10467 Several incompatibilities between puppet 5 and later ruby libs keep it from running

relates to

PUP-10393 Use '**' to pass keyword arguments in Ruby 2.7

PUP-10957 Support ruby 3 - Phase 1