[puppetsync] Don't ignore Puppet 8 failures

Puppet 8 failures should not be ignored.

Also
* Use the correct Ruby version for Puppet 8 tests
* Manage spec/spec_helper.rb in Puppet modules

.github/workflows/pr_tests.yml

@@ -115,8 +115,8 @@ jobs:
             experimental: false
           - label: 'Puppet 8.x'
             puppet_version: '~> 8.0'
-            ruby_version: 3.1
-            experimental: true
+            ruby_version: '3.2'
+            experimental: false
       fail-fast: false
     env:
       PUPPET_VERSION: ${{matrix.puppet.puppet_version}}

spec/spec_helper.rb

@@ -1,4 +1,11 @@
 # frozen_string_literal: true
+#
+# ------------------------------------------------------------------------------
+#         NOTICE: **This file is maintained with puppetsync**
+#
+# This file is automatically updated as part of a puppet module baseline.
+# The next baseline sync will overwrite any local changes made to this file.
+# ------------------------------------------------------------------------------
 
 require 'puppetlabs_spec_helper/module_spec_helper'
 require 'rspec-puppet'