Fix release 0.38.0

Replace `@@plpythonu@@` vars in old_versions

server/extension/old_versions/cdb_dataservices_server--0.11.0--0.12.0.sql

@@ -71,7 +71,7 @@ RETURNS SETOF cdb_dataservices_server.isoline AS $$
     #plpy.error(error_msg)
   finally:
     quota_service.increment_total_service_use()
-$$ LANGUAGE plpythonu SECURITY DEFINER;
+$$ LANGUAGE @@plpythonu@@ SECURITY DEFINER;
 
 
 
@@ -130,4 +130,4 @@ RETURNS boolean AS $$
     mapzen_isolines_config = MapzenIsolinesRoutingConfig(redis_conn, plpy, username, orgname)
     GD[cache_key] = mapzen_isolines_config
     return True
-$$ LANGUAGE plpythonu SECURITY DEFINER;
+$$ LANGUAGE @@plpythonu@@ SECURITY DEFINER;