fix: correct logger reference in city description worker

- Fix the logging reference to use the instance variable
  @city instead of the local variable city.

This change ensures that the correct city name is logged
upon successfully generating the city description, which
improves the clarity and accuracy of the log messages.

app/workers/generate_city_description_worker.rb

@@ -11,7 +11,7 @@ class GenerateCityDescriptionWorker
         @city = City.find(city_id)
         Rails.logger.info "Get [#{@city.name}] Description with [#{force_refresh}] force refresh."
         desc = @city.get_description("en", force_refresh)
-        Rails.logger.info "Successful Generate #{city.name} Desc: #{desc}"
+        Rails.logger.info "Successful Generate #{@city.name} Desc: #{desc}"
       ensure
         redis.del(lock_key)
       end