Add EuRuKo 2025 CFP (#994)

Author: henriquecf

_data/conferences.yml

@@ -3051,6 +3051,9 @@
   url: https://2025.euruko.org
   twitter: euruko
   announced_on: 2024-11-29
+  cfp_open_date: 2025-03-14
+  cfp_close_date: 2025-04-10
+  cfp_link: https://papercall.io/euruko-2025
 
 - name: Kaigi on Rails 2025
   location: Tokyo, Japan