Update deadlines for SeRIM 2026

Author: marcopernpruner

_events/SeRIM2026/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**:         March 1, 2026
-- **Notification to Authors**:  April 3, 2026
+- **Paper Submission**:         <s>March 1, 2026</s> <b>March 10, 2026</b> (extended)
+- **Notification to Authors**:  <s>April 3, 2026</s> <b>April 10, 2026</b> (extended)
 - **Camera Ready**:             April 16, 2026
 - **Workshop**:                 July 10, 2026