Extend Balkan Ruby 2025 CFP deadline

https://x.com/BalkanRuby/status/1885978653923725385

Author: marcoroth

_data/conferences.yml

@@ -2934,7 +2934,7 @@
   announced_on: 2024-04-28
   cfp_link: https://forms.gle/Wzp4QvDzAiWVrB7d9
   cfp_open_date: 2024-11-19
-  cfp_close_date: 2025-02-02 # TODO: seems like it's open-ended
+  cfp_close_date: 2025-02-05
 
 - name: Helvetic Ruby 2025
   location: Geneva, Switzerland