Fix Rocky Mountain Ruby 2024 end date

Author: marcoroth

_data/conferences.yml

@@ -2699,7 +2699,7 @@
 - name: Rocky Mountain Ruby 2024
   location: Boulder, Colorado
   start_date: 2024-10-07
-  end_date: 2023-10-08
+  end_date: 2024-10-08
   url: https://rockymtnruby.dev/
   twitter: rmrubyconf
   mastodon: https://ruby.social/@rockymntruby