chore(deps): update helm release argo-cd to v7.8.15

Author: renovate[bot]

app-of-apps/templates/argo-cd/application.yaml

@@ -8,7 +8,7 @@ spec:
   project: default
   source:
     repoURL: https://argoproj.github.io/argo-helm
-    targetRevision: 7.8.13
+    targetRevision: 7.8.15
     chart: argo-cd
 
     helm: