Merge branch 'update-promtail-tag-6.15.3-bb.4' into 'master'

promtail update to 6.15.3-bb.4

Closes big-bang/product/packages/promtail#34

See merge request !3680

chart/values.yaml

@@ -672,11 +672,11 @@ promtail:
   git:
     repo: https://repo1.dso.mil/big-bang/product/packages/promtail.git
     path: "./chart"
-    tag: "6.15.3-bb.1"
+    tag: "6.15.3-bb.4"
   helmRepo:
     repoName: "registry1"
     chartName: "promtail"
-    tag: "6.15.3-bb.1"
+    tag: "6.15.3-bb.4"
 
   # -- Flux reconciliation overrides specifically for the Promtail Package
   flux: {}