Update Helm release kubernetes-secret-generator to v3.4.0

This MR contains the following updates:

Package	Update	Change
kubernetes-secret-generator	minor	3.3.4 -> 3.4.0

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k8s/clusters/apps/secret-generator.yml

@@ -26,7 +26,7 @@ spec:
       source:
         repoURL: https://helm.mittwald.de
         chart: kubernetes-secret-generator
-        targetRevision: 3.3.4
+        targetRevision: 3.4.0
         helm:
           values: |
             fullnameOverride: secret-generator