Merge pull request #2513 from rackerlabs/renovate/openstack-helm-horizon-2026.x

chore(deps): update helm release openstack-helm/horizon to v2026.1.40+cb8a7b596

Author: cardoe

charts/argocd-understack/values.yaml

@@ -455,7 +455,7 @@ site:
     wave: 4
     # -- Chart version for Horizon
     # renovate: datasource=helm depName=horizon registryUrl=https://tarballs.opendev.org/openstack/openstack-helm
-    chartVersion: 2026.1.39+1275eff8c
+    chartVersion: 2026.1.40+cb8a7b596
 
   # -- Skyline (Dashboard)
   skyline: