Adds Helsinki Ruby Brigade May event (ruby-conferences#622)

* Adds Helsinki Ruby Brigade
* Add event name

Author: matiaskorhonen

_data/meetups.yml

@@ -613,3 +613,10 @@
   start_time: 18:00:00 HKT
   end_time: 20:00:00 HKT
   url: https://www.facebook.com/events/758719776072660/
+
+- name: Helsinki Ruby Brigade - Summer kick-off
+  location: Helsinki, Finland
+  date: 2024-05-29
+  start_time: 17:30:00 EEST
+  end_time: 20:30:00 EEST
+  url: https://rubybrigade.fi/event/2024/summer-kick-off/