Revert "LIVE-TEST (controller v0.237.0 slice 4), REVERTED IN THE SAME SESSION: uptime-kuma 2.4.0 -> 2.3.2"

This reverts commit 01c631d — and is itself the real catalog tag change (2.3.2 -> 2.4.0) that
Scenario A of the slice-4 live validation updates the deployed throwaway across. catalog_since is
back to its original value.

Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS

templates/uptime-kuma/.felhom.yml

@@ -10,7 +10,7 @@ subdomain: "status"
 slug: "uptime-kuma"
 # 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: "2026-09-13"
+catalog_since: "2026-07-18"
 
 # --- Resource hints (displayed on deploy screen) ---
 resources:

templates/uptime-kuma/docker-compose.yml

@@ -8,7 +8,7 @@
 
 services:
   uptime-kuma:
-    image: louislam/uptime-kuma:2.3.2
+    image: louislam/uptime-kuma:2.4.0
     container_name: uptime-kuma
     restart: unless-stopped
     environment: