Update HookOS version to latest (#125)

## Description


Update HookOS version to latest.

## Why is this needed



Fixes: #

## How Has This Been Tested?





## How are existing users impacted? What migration steps/scripts do we need?





## Checklist:

I have:

- [ ] updated the documentation and/or roadmap (if required)
- [ ] added unit or e2e tests
- [ ] provided instructions on how to upgrade

tinkerbell/stack/values.yaml

@@ -26,7 +26,7 @@ stack:
     downloadsDest: /opt/hook
     # downloadURL only works with the > 0.8.1 Hook release because
     # previous Hook versions didn't provide a checksum file.
-    downloadURL: https://github.com/tinkerbell/hook/releases/download/v0.9.0
+    downloadURL: https://github.com/tinkerbell/hook/releases/download/v0.9.1
   kubevip:
     enabled: true
     name: kube-vip