chore: update renovate to automerge dev dependencies

Author: doug-martin

renovate.json

@@ -1,5 +1,15 @@
 {
   "extends": [
     "config:base"
+  ],
+  "packageRules": [
+    {
+      "depTypeList": [
+        "devDependencies"
+      ],
+      "automerge": true
+    }
+  ],
+  "ignorePaths": [
   ]
 }