chore: Bump opa version for 25.11.0 (#893)

Author: xeniape

examples/logging/simple-kafka-cluster-opa-log4j.yaml

@@ -25,7 +25,7 @@ metadata:
   name: simple-opa
 spec:
   image:
-    productVersion: 1.0.0
+    productVersion: 1.8.0
   servers:
     roleGroups:
       default: {}

examples/opa/simple-kafka-cluster-opa-allow-all.yaml

@@ -25,7 +25,7 @@ metadata:
   name: simple-opa
 spec:
   image:
-    productVersion: 1.0.0
+    productVersion: 1.8.0
   servers:
     roleGroups:
       default: {}