Update link to CoderDojo 天白 to get latest info more quickly

Author: yasulab

db/dojos.yaml

@@ -2341,7 +2341,7 @@
   name: 天白
   prefecture_id: 23
   logo: "/img/dojos/tempaku.webp"
-  url: https://coderdojo-tempaku.hatenablog.com/
+  url: https://tempaku.connpass.com/
   description: 名古屋市天白区で月2回開催
   tags:
   - Scratch