Add Ruby devroom at FOSDEM 2024

Author: heliocola

_data/conferences.yml

@@ -2415,6 +2415,15 @@
   cfp_phrase: CFP open
   cfp_date: 2023-10-20
 
+- name: Ruby devroom at FOSDEM 2024
+  location: Brussels, Belgium
+  start_date: 2024-02-03
+  end_date: 2024-02-04
+  twitter: rubybelgium
+  url: https://fosdem.rubybelgium.be
+  cfp_phrase: CFP open
+  cfp_date: 2023-12-01
+
 - name: Sin City Ruby 2024
   location: Las Vegas, NV
   start_date: 2024-03-21