vikunja: 2.3.0 -> 2.6.0 (proven on 9202, R-462)

Walked through the product's own guarded Update on scratch guest 9202 during the
update night, seeded and read back through the app's own front door.
Evidence: felhom.eu/documentation/audits/update-night-2026-09-21/apps/vikunja/verdict.json
catalog_since -> 2026-09-22 (R-452).

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS

templates/vikunja/.felhom.yml

@@ -10,7 +10,7 @@ subdomain: "tasks"
 slug: "vikunja"
 # catalog_since: the date THIS repo last changed this app's pinned images. Any commit that
 # changes an image: line must set this to the same day (see CLAUDE.md).
-catalog_since: "2026-09-21"
+catalog_since: "2026-09-22"
 
 # --- Resource hints (displayed on deploy screen) ---
 resources:

templates/vikunja/docker-compose.yml

@@ -9,7 +9,7 @@
 
 services:
   vikunja:
-    image: vikunja/vikunja:2.3.0
+    image: vikunja/vikunja:2.6.0
     container_name: vikunja
     user: "0:0"
     restart: unless-stopped