chore(deps): update helm release open-webui to v6.20.0 (#928)

Author: renovate[bot]

clusters/home/apps/ai/open-webui/release.yml

@@ -10,7 +10,7 @@ spec:
   chart:
     spec:
       chart: open-webui
-      version: 6.19.0
+      version: 6.20.0
       sourceRef:
         kind: HelmRepository
         name: open-webui