Add year

Author: marcoroth

_data/conferences.yml

@@ -3230,7 +3230,7 @@
   cfp_close_date: 2025-06-30
   cfp_link: https://www.papercall.io/rubyconfth2026
 
-- name: Ruby for Good - Belgium
+- name: Ruby for Good - Belgium 2026
   location: Ghent, Belgium
   start_date: 2026-02-02
   end_date: 2026-02-04