Update call for papers deadline for Tropical.rb (#557)

Author: cirdes

_data/conferences.yml

@@ -2444,7 +2444,7 @@
   url: https://www.tropicalrb.com/
   twitter: tropical_rb
   cfp_phrase: CFP closes
-  cfp_date: 2023-12-31
+  cfp_date: 2024-01-10
   mastodon: https://ruby.social/@tropicalrb
 
 - name: RubyConf AU 2024