fix: sealed-secrets chart repo moved to bitnami.github.io

bitnami-labs.github.io/sealed-secrets returns 404 -- Bitnami migrated the
sealed-secrets Helm repo to the main bitnami org on 2026-06-15
(bitnami/sealed-secrets#1982), and GitHub Pages doesn't redirect the old
Pages URL. Pre-existing external breakage (last successful Argo CD sync was
2026-05-16, before the migration), not something introduced this session --
the sealed-secrets-controller pod itself kept running fine throughout, this
only blocked Argo CD's ability to diff/compare state.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

argocd/apps/sealed-secrets.yaml

@@ -8,7 +8,7 @@ metadata:
 spec:
   project: default
   sources:
-    - repoURL: https://bitnami-labs.github.io/sealed-secrets
+    - repoURL: https://bitnami.github.io/sealed-secrets
       chart: sealed-secrets
       targetRevision: 2.18.4
       helm: