fix: Use standard kustomize API in traefik addon

infrastructure/addons/traefik/kustomization.yaml

@@ -1,14 +1,4 @@
-apiVersion: kustomize.toolkit.fluxcd.io/v1
+apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
-metadata:
+resources:
-  name: addon-traefik
+  - helmrelease-traefik.yaml
-  namespace: flux-system
-spec:
-  interval: 10m
-  path: .
-  prune: true
-  sourceRef:
-    kind: GitRepository
-    name: platform
-  dependsOn:
-    - name: addon-tailscale-operator