(maint) Bump version string & puppet collections/streams for puppet8

These changes are for PA-4814: https://tickets.puppetlabs.com/browse/PA-4814

Author: AriaXLi

.gemspec

@@ -13,7 +13,7 @@
 
 Gem::Specification.new do |s|
   s.name = "puppet"
-  version = "7.22.0"
+  version = "8.0.0"
   mdata = version.match(/(\d+\.\d+\.\d+)/)
   s.version = mdata ? mdata[1] : version
 

ext/build_defaults.yaml

@@ -15,4 +15,4 @@ apt_signing_server: 'apt.puppetlabs.com'
 apt_repo_url: 'http://apt.puppetlabs.com'
 apt_repo_path: '/opt/repository/incoming'
 tar_host: 'downloads.puppetlabs.com'
-nonfinal_gem_path: '/opt/repository-nightlies/downloads/gems/puppet7-nightly'
+nonfinal_gem_path: '/opt/repository-nightlies/downloads/gems/puppet8-nightly'

lib/puppet/version.rb

@@ -6,7 +6,7 @@
 # Raketasks and such to set the version based on the output of `git describe`
 
 module Puppet
-  PUPPETVERSION = '7.22.0'
+  PUPPETVERSION = '8.0.0'
 
   ##
   # version is a public API method intended to always provide a fast and