(PA-7433) Update task_spec to upgrade from puppet7 to latest puppet8 dev build#781

AriaXLi wants to merge 1 commit intopuppetlabs:mainpuppetlabs/puppetlabs-puppet_agent:mainfrom

AriaXLi:PA-7433/task_spec_puppet7_puppet8AriaXLi/puppetlabs-puppet_agent:PA-7433/task_spec_puppet7_puppet8Copy head branch name to clipboard