Update ghcr.io/fluxcd/source-controller Docker tag to v0.15.3

hardening_manifest.yaml

@@ -8,7 +8,7 @@ name: "fluxcd/source-controller"
 # The most specific version should be the first tag and will be shown
 # on ironbank.dsop.io
 tags:
-- "v0.15.2"
+- "v0.15.3"
 - "latest"
 
 # Build args passed to Dockerfile ARGs
@@ -27,7 +27,7 @@ labels:
   org.opencontainers.image.url: "https://github.com/fluxcd/source-controller"
   ## Name of the distributing entity, organization or individual
   org.opencontainers.image.vendor: "fluxcd"
-  org.opencontainers.image.version: "v0.15.2"
+  org.opencontainers.image.version: "v0.15.3"
   ## Keywords to help with search (ex. "cicd,gitops,golang")
   mil.dso.ironbank.image.keywords: "gitops,kubernetes"
   ## This value can be "opensource" or "commercial"