Update Testing United 2026 dates (#896)

Author: Copilot

_data/current.yml

@@ -248,6 +248,6 @@
 
 - name: Testing United
   location: Copenhagen, Denmark
-  dates: "November 23-24, 2026"
+  dates: "November 25-26, 2026"
   url: "https://www.testingunited.com/?utm_source=testingconferences"
   status: <a href="https://www.eventora.com/en/Events/testing-united?utm_source=testingconferences" target="_blank">Early Bird Registration is Open</a> until June 30, 2026