chore: Update renovate config

Author: relekang

.github/renovate.json

@@ -11,24 +11,31 @@
   "autoApprove": true,
   "automergeStrategy": "rebase",
   "automergeType": "pr",
+  "automerge": true,
   "ignoreTests": false,
   "dependencyDashboard": true,
   "npm": {
     "stabilityDays": 3
   },
   "packageRules": [
     {
-      "enabled": false,
       "matchUpdateTypes": [
         "major"
       ],
-      "prPriority": -2
+      "prPriority": -2,
+      "automerge": false
     },
     {
       "matchDepTypes": [
         "dependencies"
       ],
       "prPriority": 2
+    },
+    {
+      "matchDepTypes": [
+        "devDependencies"
+      ],
+      "prPriority": -5
     }
   ]
 }