Fix GB country code lookup

Author: marcoroth

_data/meetups.yml

@@ -1692,7 +1692,7 @@
   url: https://www.meetup.com/bangkok-rb/events/303075559
 
 - name: 'BelfastRuby - Ruby On Rails: TBD'
-  location: Belfast, United Kingdom of Great Britain and Northern Ireland
+  location: Belfast, UK
   date: 2024-09-24
   start_time: 19:00:00 BST
   end_time: 21:00:00 BST
@@ -1748,7 +1748,7 @@
   url: https://bluegrassruby.club/
 
 - name: Brighton Ruby Group - We're Back From The Dead
-  location: Brighton, United Kingdom of Great Britain and Northern Ireland
+  location: Brighton, UK
   date: 2024-10-01
   start_time: 18:00:00 BST
   end_time: 20:00:00 BST

src/events/meetup_event.rb

@@ -30,7 +30,7 @@ def event_location
       "Online"
     elsif country.alpha2 == "US"
       "#{city}, #{state.upcase}"
-    elsif country.alpha2 == "UK"
+    elsif country.alpha2 == "GB"
       "#{city}, UK"
     elsif country.alpha2 == "TW"
       "#{city}, Taiwan"