updated related tags expiry for reltags delegated to reportbooru service

app/models/tag.rb

@@ -812,6 +812,8 @@ class Tag < ApplicationRecord
         else
           sqs = SqsService.new(Danbooru.config.aws_sqs_reltagcalc_url)
           sqs.send_message("calculate #{name}")
+          self.related_tags_updated_at = Time.now
+          save
         end
 
         Cache.put("urt:#{key}", true, 600) # mutex to prevent redundant updates