Add LRUG September 2024 meetup (ruby-conferences#750)

* Add LRUG September 2024 meetup

---------

Co-authored-by: Marco Roth <marco.roth@intergga.ch>

Author: fcheung

_data/meetups.yml

@@ -1437,6 +1437,13 @@
   end_time: 13:00:00 EAT
   url: https://www.meetup.com/african_ruby_community/events/300548245
 
+- name: London Ruby User Group - September 2024 Meeting
+  location: London, UK
+  date: 2024-09-09
+  start_time: 18:00:00 BST
+  end_time: 20:00:00 BST
+  url: https://lrug.org/meetings/2024/september/
+  
 - name: Boston Ruby Group - Project Night September 2024
   location: Boston, MA
   date: 2024-09-09