Fix 2.7 warnings by extracting kwargs

When arguments are aggregated using *args, the kwargs
are represented as a hash. Let's use **kwargs to separate
them from args

ee/app/models/ee/merge_request.rb

@@ -79,7 +79,7 @@ module EE
         super.preload(:blocking_merge_requests)
       end
 
-      def sort_by_attribute(method, *args)
+      def sort_by_attribute(method, *args, **kwargs)
         if method.to_s == 'review_time_desc'
           order_review_time_desc
         else

lib/api/helpers/pagination.rb

@@ -3,8 +3,8 @@
 module API
   module Helpers
     module Pagination
-      def paginate(*args)
-        Gitlab::Pagination::OffsetPagination.new(self).paginate(*args)
+      def paginate(*args, **kwargs)
+        Gitlab::Pagination::OffsetPagination.new(self).paginate(*args, **kwargs)
       end
     end
   end