Remove latest news to check if #1748 fixes to upsert found news article with deployment automatically

Author: yasulab

db/news.yml

@@ -1,9 +1,5 @@
 ---
 news:
-- id: 12
-  url: https://news.coderdojo.jp/2025/09/10/dojoletter-vol-88-2025%e5%b9%b407%e6%9c%88%e5%8f%b7/
-  title: DojoLetter Vol.88 2025年07月号
-  published_at: Wed, 10 Sep 2025 03:45:56 +0000
 - id: 11
   url: https://news.coderdojo.jp/2025/08/12/dojoletter-vol-87-2025%e5%b9%b406%e6%9c%88%e5%8f%b7/
   title: DojoLetter Vol.87 2025年06月号