rebase to upstream

Author: graial

_data/conferences.yml

@@ -2913,6 +2913,13 @@
   cfp_close_date: 2025-02-13
   cfp_link: https://docs.google.com/forms/d/e/1FAIpQLSdg-w3hF3V-Q7hNwXKzqEUv_y92oQaYWu4FSziFRhwEyMo3Hw/viewform
 
+- name: Sin City Ruby 2025
+  location: Las Vegas, NV
+  start_date: 2025-04-10
+  end_date: 2025-04-11
+  url: https://www.sincityruby.com
+  announced_on: 2024-11-14
+
 - name: RubyKaigi 2025
   location: Matsuyama, Ehime, Japan
   start_date: 2025-04-16