fix(blocky): update blocky dashboard (#29316)

The dashboard shipped with truecharts uses old metric
"blocky_blacklist_cache" and some panels don't work


![immagine](https://github.com/user-attachments/assets/79f9451a-cdf4-45fe-9c37-4d596f61f6c0)

I updated the dashboard to rev4 and also normalized the json with jq.
now it uses the metric "blocky_denylist_cache" and the panel has data


![immagine](https://github.com/user-attachments/assets/21aa9784-6b3e-4f41-8832-7afba2662190)

**⚙️ Type of change**

- [ ] ⚙️ Feature/App addition
- [x] 🪛 Bugfix
- [ ] ⚠️ Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] 🔃 Refactor of current code

charts/premium/blocky/Chart.yaml

@@ -43,4 +43,4 @@ sources:
   - https://hub.docker.com/r/spx01/blocky
   - https://quay.io/oriedge/k8s_gateway
 type: application
-version: 16.6.3
+version: 16.6.4