Update quay.io/argoproj/argocd Docker tag to v3

Author: renovate[bot]

apps/argocd/kustomization.yaml

@@ -16,7 +16,7 @@ resources:
 namespace: argocd
 images:
 - name: quay.io/argoproj/argocd
-  newTag: v2.14.20
+  newTag: v3.1.8
 patches:
 - patch: |-
     - op: replace