Update link to CoderDojo 札幌 to check latest events more quickly

Author: yasulab

db/dojos.yaml

@@ -4,7 +4,7 @@
   created_at: '2016-09-26'
   name: 札幌
   prefecture_id: 1
-  url: https://coderdojo-sapporo.jp/
+  url: https://coderdojo-sapporo.connpass.com/
   logo: "/img/dojos/sapporo.webp"
   description: 札幌市で月2回開催
   tags: