Update Gitlab to bb.4 in values.yaml

chart/values.yaml

@@ -789,7 +789,7 @@ addons:
     git:
       repo: https://repo1.dso.mil/platform-one/big-bang/apps/developer-tools/gitlab.git
       path: "./chart"
-      tag: "6.0.1-bb.3"
+      tag: "6.0.1-bb.4"
 
     # -- Flux reconciliation overrides specifically for the Gitlab Package
     flux: {}