Update colm.yml (#948)

Extended deadlines, cf. https://colmweb.org/cfp.html

Author: gdemelo

conference/AI/colm.yml

@@ -20,8 +20,8 @@
         id: colm25
         link: https://colmweb.org/cfp.html
         timeline:
-          - abstract_deadline: '2025-03-20 23:59:59'
-            deadline: '2025-03-27 23:59:59'
+          - abstract_deadline: '2025-03-22 23:59:59'
+            deadline: '2025-03-28 23:59:59'
         timezone: AoE
         date: October 7-9, 2025
         place: Palais des Congrès Montreal, Canada