Fix wrong connpass ID in CoderDojo 品川御殿山

cf. https://www.facebook.com/groups/coderdojo.jp/posts/6324754490971230/\?comment_id\=6325810730865606\&reply_comment_id\=6328606613919351

Author: yasulab

db/dojo_event_services.yaml

@@ -1200,9 +1200,10 @@
   group_id: 227758594569000
   url: https://www.facebook.com/coderdojo.fukuoka.kurume.suwano/events/
 
+# 品川御殿山
 - dojo_id: 173
   name: connpass
-  group_id: 640
+  group_id: 6440
   url: https://coderdojo-shinagawa-gotenyama.connpass.com/
 
 # 三鷹