Update conferences.yml: extended deadline

Author: checkmate-workshop

_data/conferences.yml

@@ -995,7 +995,7 @@
   description: Research on offensive and defensive techniques in the context of Man At The End (MATE) attacks
   year: 2024
   link: https://checkmate-workshop.github.io/
-  deadline: ["2024-06-20 23:59"]
+  deadline: ["2024-07-12 23:59"]
   comment: Co-located with ACM CCS 2024
   date: October 18
   place: Salt Lake City, USA