fix date for hackathon, it is 2025 not 2024

Signed-off-by: Felix Kronlage-Dammers <fkr@hazardous.org>

Author: fkr

onetimes.yml

@@ -11,7 +11,7 @@ events:
       Coordinator: Friederike Zelke <zelke[at]osb-alliance.com>
     location: "GONICUS GmbH, Möhnestraße 55, 59755 Arnsberg, Germany"
   - summary: "SCS Hackathon #5 - 2025"
-    begin: 2024-04-29 12:00:00
+    begin: 2025-04-29 12:00:00
     duration:
       minutes: 1500
     description: |