Update Helm release external-secrets to v0.20.3

Author: renovate[bot]

contentgrid-junit-jupiter-k8s/src/main/resources/com/contentgrid/junit/jupiter/externalsecrets/chart/Chart.yaml

@@ -4,5 +4,5 @@ name: external-secrets-operator
 description: "Installs external-secrets-operator, including the necessary network policies when required"
 dependencies:
   - name: external-secrets
-    version: 0.20.2
+    version: 0.20.3
     repository: "https://charts.external-secrets.io/"