chore(deps): update argo-cd docker tag to v7.8.8 (#6428)

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

gitops/argocd/charts/gitops/argo-cd/Chart.yaml

@@ -10,4 +10,4 @@ appVersion: 1.0.0
 dependencies:
 - name: argo-cd
   repository: oci://ghcr.io/argoproj/argo-helm
-  version: 7.8.0
+  version: 7.8.8