longhorn: upgrade from 1.9.0 to 1.12.0 (with intermediate releases)

Change-Id: Ice8f4e8f7e073023ab274c83154d9368525f9231
diff --git a/charts/longhorn/ocp-readme.md b/charts/longhorn/ocp-readme.md
index d2fb98e..f009b80 100644
--- a/charts/longhorn/ocp-readme.md
+++ b/charts/longhorn/ocp-readme.md
@@ -142,10 +142,11 @@
 Minimum Adjustments Required
 
 ```yaml
-openshift:
-  oauthProxy:
-    repository: quay.io/openshift/origin-oauth-proxy
-    tag: 4.15  # Use Your OCP/OKD 4.X Version, Current Stable is 4.15
+image:
+  openshift:
+    oauthProxy:
+      repository: quay.io/openshift/origin-oauth-proxy
+      tag: 4.18  # Use Your OCP/OKD 4.X Version, Current Stable is 4.18
 
 # defaultSettings: # Preparing nodes (Optional)
   # createDefaultDiskLabeledNodes: true