fix(helm): update chart external-secrets to 0.9.20 (#6662)

| datasource | package          | from   | to     |
| ---------- | ---------------- | ------ | ------ |
| helm       | external-secrets | 0.9.19 | 0.9.20 |

Co-authored-by: rosey-the-renovator-bot[bot] <98764075+rosey-the-renovator-bot[bot]@users.noreply.github.com>

kubernetes/main/apps/kube-system/external-secrets/app/helmrelease.yaml

@@ -10,7 +10,7 @@ spec:
   chart:
     spec:
       chart: external-secrets
-      version: 0.9.19
+      version: 0.9.20
       sourceRef:
         kind: HelmRepository
         name: external-secrets