fixes namespace for cert-manager

gitops-kaisers-info/templates/cert-manager.yaml

 kind: Application
 metadata:
   name: cert-manager
-  namespace: cert-manager
+  namespace: {{ .Values.spec.namespace }}
   finalizers:
   - resources-finalizer.argocd.argoproj.io
 spec:
 kind: Application
 metadata:
   name: cert-manager-hetzner-webhook
-  namespace: cert-manager
+  namespace: {{ .Values.spec.namespace }}
   finalizers:
   - resources-finalizer.argocd.argoproj.io
 spec:
 kind: Secret
 metadata:
   name: hetzner-secret
-  namespace: cert-manager
 type: Opaque
 data:
   api-key: M21TS3N1bzAzTVNld1JQeW12aVFpSU5TbFhPc0lBOFU=