Bump Gatekeeper Tag

Package changes:

https://repo1.dso.mil/platform-one/big-bang/apps/core/policy/-/commit/927d678531c5ca00636a94670fff2e3171e31c4e

chart/values.yaml

@@ -226,7 +226,7 @@ gatekeeper:
   git:
     repo: https://repo1.dso.mil/platform-one/big-bang/apps/core/policy.git
     path: "./chart"
-    tag: "3.3.0-bb.3"
+    tag: "3.3.0-bb.4"
 
   # -- Flux reconciliation overrides specifically for the OPA Gatekeeper Package
   flux: {}