fix nested attributes

Author: westonganger

lib/active_record/mass_assignment_security/nested_attributes.rb

@@ -79,7 +79,7 @@ def assign_nested_attributes_for_collection_association(association_name, attrib
         class_name = attributes_collection.class.name
 
         if class_name == 'ActionController::Parameters'
-          attributes_collection = attributes_collection.to_h
+          attributes_collection = attributes_collection.to_unsafe_h
         elsif !['Hash','Array'].include?(class_name)
           raise ArgumentError, "ActionController::Parameters or Hash or Array expected, got #{attributes_collection.class.name} (#{attributes_collection.inspect})"
         end