feat(config): disable updates for specific GitLab package

Add a package rule in `renovate.json` to disable updates for the 
`registry.gitlab.com/unboundsoftware/schemas-app` package 
managed by Kubernetes. This change is implemented to prevent 
unwanted updates for this specific package, ensuring stability 
in the deployment process.

renovate.json

@@ -2,5 +2,16 @@
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
   "extends": [
     "config:recommended"
+  ],
+  "packageRules": [
+    {
+      "matchManagers": [
+        "kubernetes"
+      ],
+      "matchPackageNames": [
+        "registry.gitlab.com/unboundsoftware/schemas-app"
+      ],
+      "enabled": false
+    }
   ]
 }