Update Helm release external-secrets to v0.20.4

Author: renovate[bot]

external-secrets/kustomization.yaml

@@ -6,7 +6,7 @@ helmCharts:
     repo: https://charts.external-secrets.io/
     releaseName: external-secrets
     namespace: external-secrets
-    version: 0.16.2
+    version: 0.20.4
     valuesFile: values.yaml
 
 resources: