Test against Ruby 2.6.6 and 2.7.1. Update to latest patch releases for 2.2 through 2.5
Test against Ruby 2.6.6 and 2.7.1. Update to latest patch releases for 2.2 through 2.5

Signed-off-by: Gavin Reynolds <33fd0301077bc24fc6513513c71e288fcecc0c66@chef.io>

arangamani/jenkins_api_client,arangamani/jenkins_api_client