Remove faulty override of renovate packageRules

Author: janhoy

.github/renovate.json

@@ -10,12 +10,5 @@
   "prConcurrentLimit": 100,
   "prHourlyLimit": 10,
   "branchPrefix": "renovate-9x/",
-  "commitMessageSuffix": " (branch_9x)",
-  "packageRules": [
-    {
-      "description": "Skip errorprone upgrades since newer versions require JDK17",
-      "matchPackagePrefixes": ["com.google.errorprone"],
-      "enabled": false
-    }
-  ]
+  "commitMessageSuffix": " (branch_9x)"
 }