fix(starboard): Fix starboard repository metadata

infrastructure/starboard/repository.yaml

 apiVersion: source.toolkit.fluxcd.io/v1beta1
 kind: HelmRepository
 metadata:
-  name: longhorn
-  namespace: longhorn-system
+  name: aqua
+  namespace: starboard-system
 spec:
   interval: 30m
   url: https://aquasecurity.github.io/helm-charts/