Add Ruby Warsaw Community Conference 2024 Summer Edition (ruby-conferences#641)

Author: marcoroth

_data/conferences.yml

@@ -2304,7 +2304,7 @@
   location: Warsaw, Poland
   start_date: 2023-07-21
   end_date: 2023-07-21
-  url: https://www.rubycommunityconference.com
+  url: https://www.rubycommunityconference.com/summer2023.html
   twitter: visualitypl
   video_link: https://www.youtube.com/playlist?list=PLvMNoWK93wtmlQyKf59wu0IZk9N7ZpWpJ
 
@@ -2462,7 +2462,7 @@
   location: Warsaw, Poland
   start_date: 2024-02-02
   end_date: 2024-02-02
-  url: https://www.rubycommunityconference.com
+  url: https://www.rubycommunityconference.com/winter2024
   twitter: visualitypl
 
 - name: Sin City Ruby 2024
@@ -2609,6 +2609,13 @@
   cfp_close_date: 2024-02-29
   cfp_link: https://forms.reform.app/goodscary/brighton-ruby-2024-cfp/gci0d6
 
+- name: Ruby Warsaw Community Conference 2024 Summer Edition
+  location: Warsaw, Poland
+  start_date: 2024-07-19
+  end_date: 2024-07-19
+  url: https://www.rubycommunityconference.com
+  twitter: visualitypl
+
 - name: RedDotRubyConf 2024
   location: Singapore
   start_date: 2024-07-25