chore: bump istio control plane version

chart/values.yaml

@@ -173,7 +173,7 @@ istiooperator:
   git:
     repo: https://repo1.dso.mil/platform-one/big-bang/apps/core/istio-operator.git
     path: "./chart"
-    tag: "1.8.4-bb.2"
+    tag: "1.8.4-bb.6"
 
   # -- Flux reconciliation overrides specifically for the Istio Operator Package
   flux: {}