bump istio to 1.8.4-bb.2

(cherry picked from commit 619fdeb2)

chart/values.yaml

@@ -101,7 +101,7 @@ istio:
   git:
     repo: https://repo1.dso.mil/platform-one/big-bang/apps/core/istio-controlplane.git
     path: "./chart"
-    tag: "1.8.4-bb.1"
+    tag: "1.8.4-bb.2"
 
   # -- Flux reconciliation overrides specifically for the Istio Package
   flux: {}