Merge pull request awesome-mlss#267 from AntoAndGar/modified_IAISS25

modified IAISS25 deadline according to official site

Author: sshkhr

site/_data/summerschools.yml

@@ -111,7 +111,7 @@
   id: IAISS25
   full_name: "International Artificial Intelligence Summer School (IAISS) 2025"
   link: "https://2025.iaiss.cc/"
-  deadline: "2025-03-23 23:59:59"
+  deadline: "2025-04-23 23:59:59"
   timezone: "Europe/Rome"
   place: "Grosseto, Italy"
   date: "Sep 21 - Sep 25, 2025"