add github_actions to exclude list

Rakefile

@@ -2,7 +2,7 @@ begin
   require 'github_changelog_generator/task'
   GitHubChangelogGenerator::RakeTask.new :changelog do |config|
     config.header = "# Changelog\n\nAll notable changes to this project will be documented in this file.\nEach new release typically also includes the latest modulesync defaults.\nThese should not affect the functionality of the module."
-    config.exclude_labels = %w{duplicate question invalid wontfix wont-fix modulesync skip-changelog}
+    config.exclude_labels = %w[duplicate question invalid wontfix wont-fix modulesync skip-changelog github_actions]
     config.user = 'voxpupuli'
     config.project = 'puppet-catalog-diff-viewer'
     config.future_release = '0.8.0'