Update SmartSP deadline

Author: zihaozhan

_data/conferences.yml

@@ -1024,7 +1024,7 @@
   description: EAI International Conference on Security and Privacy in Cyber-Physical Systems and Smart Vehicles
   year: 2024
   link: https://smartsp.eai-conferences.org/2024/
-  deadline: ["2024-07-01 23:59"]
+  deadline: ["2024-07-15 23:59"]
   date: November 7-8
   place: New Orleans, USA
   tags: [SEC, PRIV, CONF]