chore(deps): update helm chart longhorn to v1.8.0

Author: renovate[bot]

Diff for: infrastructure/longhorn-system/longhorn.yaml

@@ -9,7 +9,7 @@ spec:
     spec:
       # renovate: registryUrl=https://charts.longhorn.io
       chart: longhorn
-      version: 1.1.2
+      version: 1.8.0
       sourceRef:
         kind: HelmRepository
         name: longhorn