longhorn: upgrade to 1.11.2

Last hop of the Longhorn upgrade for Kubernetes 1.33. Stays on 1.11.2:
1.11.3 ships csi-provisioner v6.3.0 and needs Kubernetes 1.34. The
1.11.2 chart still declares kubeVersion >=1.25 and ships csi-provisioner
v5.3.0, and renders our values unchanged.

Checked beforehand: 17 healthy volumes plus 2 detached, no backing
images, system backup pre-upgrade-v1-10-2-202610221449 is Ready. PV
nodeAffinity recorded to compare after the upgrade (1.11.0 had a
regression there, fixed in 1.11.2).

apps/templates/longhorn-helm.yaml

@@ -16,8 +16,9 @@ spec:
   sources:
     - chart: longhorn
       repoURL: https://charts.longhorn.io/
-      # One minor at a time up to 1.11.2, see docs/upgrade-k8s-1.33.md
-      targetRevision: 1.10.2
+      # Stay on 1.11.2 while on Kubernetes 1.33: 1.11.3 and newer need 1.34,
+      # see docs/upgrade-k8s-1.33.md
+      targetRevision: 1.11.2
       helm:
         values: |
           persistence: