fix: Remove namespace for sealed-secrets

"Once you deploy the manifest it will create the SealedSecret resource
and install the controller into kube-system namespace, create a service
account and necessary RBAC roles."

apps/sealed-secrets.yaml

@@ -11,11 +11,7 @@ spec:
     path: infra/sealed-secrets
   destination:
     server: https://kubernetes.default.svc
-    namespace: sealed-secrets
   syncPolicy:
     automated:
       prune: true
       selfHeal: true
-    syncOptions:
-      - CreateNamespace=true
-