Update SeRIM 2025 important dates

Author: marcopernpruner

_events/SeRIM2025/includes/important-dates.md

@@ -1,5 +1,5 @@
 All deadlines are 11:59 PM [Anywhere on Earth](https://www.worldtimeserver.com/time-zones/aoe/).
-- **Paper Submission**:         February 13, 2025
-- **Notification to Authors**:  March 24, 2025
-- **Camera Ready**:             April 7, 2025
+- **Paper Submission**:         <s>February 13, 2025</s> February 27, 2025 (extended)
+- **Notification to Authors**:  <s>March 24, 2025</s> March 31, 2025 (extended)
+- **Camera Ready**:             <s>April 7, 2025</s> April 14, 2025 (extended)
 - **Workshop**:                 July 4, 2025