Remove unused code for puppetlabs_spec_helper

Since voxpupuli-test it no longer uses puppetlabs_spec_helper.

Fixes: e326beb ("voxpupuli-test: Update 9.x -> 10.x")

Author: ekohl

moduleroot/Rakefile.erb

@@ -1,15 +1,10 @@
 # Managed by modulesync - DO NOT EDIT
 # https://voxpupuli.org/docs/updating-files-managed-with-modulesync/
 
-# Attempt to load voxpupuli-test (which pulls in puppetlabs_spec_helper),
-# otherwise attempt to load it directly.
 begin
   require 'voxpupuli/test/rake'
 rescue LoadError
-  begin
-    require 'puppetlabs_spec_helper/rake_tasks'
-  rescue LoadError
-  end
+  # only available if gem group test is installed
 end
 
 # load optional tasks for acceptance