Replace @@plpythonu@@ vars in old_versions

server/extension/old_versions/cdb_dataservices_server--0.1.0--0.2.0.sql

@@ -22,7 +22,7 @@ RETURNS boolean AS $$
     # --for this user session but...
     GD[cache_key] = geocoder_config
     return True
-$$ LANGUAGE plpythonu SECURITY DEFINER;
+$$ LANGUAGE @@plpythonu@@ SECURITY DEFINER;
 
 -- Get the connection to redis from cache or create a new one
 CREATE OR REPLACE FUNCTION cdb_dataservices_server._connect_to_redis(user_id text)
@@ -53,7 +53,7 @@ RETURNS boolean AS $$
       'redis_metrics_connection': redis_metrics_connection,
     }
     return True
-$$ LANGUAGE plpythonu SECURITY DEFINER;
+$$ LANGUAGE @@plpythonu@@ SECURITY DEFINER;
 
 CREATE OR REPLACE FUNCTION cdb_dataservices_server._cdb_here_geocode_street_point(username TEXT, orgname TEXT, searchtext TEXT, city TEXT DEFAULT NULL, state_province TEXT DEFAULT NULL, country TEXT DEFAULT NULL)
 RETURNS Geometry AS $$