Re-activate CoderDojo 渋谷 based on these references:

- https://twitter.com/burakon/status/1774651753474269231
- https://coderdojo.com/en/find?search=Shibuya

Author: yasulab

db/dojos.yaml

@@ -1146,7 +1146,7 @@
   - JavaScript
 - id: 19
   order: '131130'
-  is_active: false
+  is_active: true # Re-activated @ 2024/04/01
   created_at: '2020-01-30'
   name: 渋谷
   prefecture_id: 13