fix(longhorn): upgrade to v1.11.1, fix 38GB instance-manager memory leak

v1.11.0 had a critical proxy connection leak in the instance-manager
(longhorn/longhorn#12575) that consumed 38.8GB on apollo, pushing the
server to 92% memory with swap exhausted.

v1.11.1 fixes the leak. Also adds a 2Gi per-container LimitRange in
longhorn-system as a safety net against future regressions.

base/longhorn/values.yaml

@@ -22,3 +22,21 @@ defaultSettings:
 persistence:
   defaultClass: true
   defaultClassReplicaCount: 1
+
+# Cap instance-manager memory as a safety net against future leaks.
+# v1.11.0 had a proxy connection leak (longhorn/longhorn#12575) that let
+# instance-manager grow to 38 GB+. Fixed in v1.11.1, but the LimitRange
+# ensures any regression is OOM-killed at 2 Gi instead of eating all RAM.
+extraObjects:
+  - apiVersion: v1
+    kind: LimitRange
+    metadata:
+      name: instance-manager-limits
+      namespace: longhorn-system
+    spec:
+      limits:
+        - type: Container
+          default:
+            memory: 2Gi
+          defaultRequest:
+            memory: 128Mi