Add SF Ruby, Charlotte Ruby, and RubyJax Meetups (#1092)

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

Author: github-actions[bot]

_data/meetups.yml

@@ -6779,6 +6779,13 @@
   end_time: 17:00:00 PDT
   url: https://lu.ma/znhcct7v
 
+- name: The San Francisco Ruby - SF Ruby AI Hackathon
+  location: San Francisco, CA
+  date: 2025-07-19
+  start_time: 10:00:00 PDT
+  end_time: 17:00:00 PDT
+  url: https://www.meetup.com/sfruby/events/308374196
+
 - name: 'Auckland Ruby - Ruby Nights July: TBC'
   location: Auckland, New Zealand
   date: 2025-07-21
@@ -7310,3 +7317,17 @@
   start_time: 19:00:00 CST
   end_time: 19:00:00 CST
   url: https://www.meetup.com/rails-taiwan/events/qxfvjkyhcnbcb
+
+- name: Charlotte Ruby - Ruby Hack Night October 2025
+  location: Online
+  date: 2025-10-07
+  start_time: 19:00:00 EDT
+  end_time: 21:30:00 EDT
+  url: https://www.meetup.com/charlotte-rb/events/mhkrrtyhcnbkb
+
+- name: RubyJax - Open Hax October 2025
+  location: Jacksonville, FL
+  date: 2025-10-07
+  start_time: 18:30:00 EDT
+  end_time: 20:00:00 EDT
+  url: https://www.meetup.com/rubyjax/events/llklbtyhcnbkb