Fix deadline again

`~~` does not work on the article.

Author: mopp

_posts/blog/2025-06-07-vimconf2025small-call-for-proposal-ja.md

@@ -9,7 +9,6 @@ title: VimConf 2025 Small の登壇者を募集します
 [応募フォーム](https://forms.gle/7Pu4uvE4t8d9veBD6)はこちら
 
 - 締切
-  - ~2025-07-21 23:59:59.999999 JST~
   - **2025-07-20 23:59:59.999999 JST**
 - 結果発表
   - 2025-07-23 23:59:59.999999 JST