Make merge parameter data types actually backwards compatible

`Hash` defaults to `Hash[Scalar,Data]` however, class/type references are valid hash values but are not covered by the `Data` type.

see also voxpupuli/puppet-jenkins#909

Author: LadyNamedLaura

lib/puppet/functions/merge.rb

@@ -40,7 +40,7 @@
   # @return
   #   The merged hash
   dispatch :merge2hashes do
-    repeated_param 'Variant[Hash, Undef, String[0,0]]', :args # this strange type is backwards compatible
+    repeated_param 'Variant[Hash[Scalar,Any], Undef, String[0,0]]', :args # this strange type is backwards compatible
     return_type 'Hash'
   end