Update uist.yml - UIST 25 deadlines AoE

Author: makinteract

conferences/uist.yml

@@ -30,7 +30,7 @@
   link: https://uist.acm.org/2025/
   deadline: '2025-04-09 17:00:00'
   abstract_deadline: '2025-04-02 17:00:00'
-  timezone: UTC-8
+  timezone: UTC-12
   place: Busan, Korea
   date: September 28th - October 1st, 2025
   start: 2025-09-28