Add React Summit US 2026 delivery

Co-authored-by: Kent C. Dodds <me+github@kentcdodds.com>

Author: cursoragent

services/site/content/data/talks.yml

@@ -6,6 +6,8 @@
       date: 2026-09-17
     - event: '[Nerdearla Argentina 2026](https://nerdearla.com/en/argentina/)'
       date: 2026-09-24
+    - event: '[React Summit US](https://reactsummit.us/)'
+      date: 2026-11-17
 
 - title: 'How I Build Web Applications in 2026'
   deliveries: