chore(flux): update image spegel 3.4.0 → 4.0.0 (clustertool) (#37015)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [spegel](https://truecharts.org/charts/system/spegel)
([source](https://ghcr.io/spegel-org/spegel)) | major | `3.4.0` ->
`4.0.0` |

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clustertool/embed/generic/kubernetes/system/spegel/app/helm-release.yaml

@@ -10,7 +10,7 @@ spec:
   chart:
     spec:
       chart: spegel
-      version: 3.4.0
+      version: 4.0.0
       sourceRef:
         kind: HelmRepository
         name: truecharts