gitops: upgrade cert-manager to: v1.20.2

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

gitops/home-kubernetes/cert-manager/helmrelease.yaml

@@ -8,7 +8,7 @@ spec:
   chart:
     spec:
       chart: cert-manager
-      version: "v1.17.2"
+      version: "v1.20.2"
       sourceRef:
         kind: HelmRepository
         name: cert-manager

gitops/home-kubernetes/flux-system/extra-kustomizations.yaml

@@ -143,6 +143,19 @@ spec:
   sourceRef:
     kind: GitRepository
     name: flux-system
+---
+apiVersion: kustomize.toolkit.fluxcd.io/v1
+kind: Kustomization
+metadata:
+  name: fuj
+  namespace: flux-system
+spec:
+  interval: 10m0s
+  path: ./gitops/home-kubernetes/fuj
+  prune: true
+  sourceRef:
+    kind: GitRepository
+    name: flux-system
 # ---
 # apiVersion: kustomize.toolkit.fluxcd.io/v1
 # kind: Kustomization