chore(deps): update renovatebot config.

Author: Codex-

.github/renovate.json

@@ -1,13 +1,13 @@
 {
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
-  "extends": ["config:base", "group:allNonMajor"],
+  "extends": ["config:base", "group:allNonMajor", "schedule:monthly"],
   "timezone": "Pacific/Auckland",
   "labels": ["dependencies"],
   "rangeStrategy": "bump",
   "lockFileMaintenance": {
     "enabled": true,
     "automerge": true,
-    "schedule": ["on the first day of the month"]
+    "schedule": ["every 3 months on the first day of the month"]
   },
   "packageRules": [
     {