docs(tuto): update date (#5646)

Author: ofranc

tutorials/stop-outgoing-spam/index.mdx

@@ -5,7 +5,7 @@ tags: Instances spam
 products:
   - instances
 dates:
-  validation: 2024-04-22
+  validation: 2025-10-13
   posted: 2020-08-24
   validation_frequency: 24
 difficulty: beginner