Yep, there was a problem with unique-ing by name

The class would change, and we would have no way of knowing if it was
the correct version. Instead I added code that will group them by name,
then find the most recent one by using `#object_id`

The documentation says that no two objects would ever have the same
`object_id` lets test that theory.

lib/dato_cms_graphql.rb

@@ -54,7 +54,10 @@ def self.queries
     raise "\"#{@path_to_queries}\" does not exist" unless File.exist?(@path_to_queries)
 
     Dir[File.join(@path_to_queries, "*.rb")].sort.each { require(_1) }
-    ObjectSpace.each_object(::Class).select { |klass| klass < DatoCmsGraphql::GraphqlBase }.uniq(&:name)
+    ObjectSpace.each_object(::Class)
+      .select { |klass| klass < DatoCmsGraphql::GraphqlBase }
+      .group_by(&:name).values.map { |values| values.max_by(&:object_id) }
+      .flatten
   end
 
   def self.path_to_queries=(value)