chore(deps): update renovate config

prevent renovate from upgrading node-fetch to v3
will investigate dual release with upgrade or switching to another
fetch library

Author: p-j

renovate.json

@@ -4,5 +4,11 @@
   "lockFileMaintenance": {
     "extends": ["group:all"],
     "commitMessageAction": "chore(dependencies): update dependencies"
-  }
+  },
+  "packageRules": [
+    {
+      "matchPackageNames": ["node-fetch", "@types/node-fetch"],
+      "allowedVersions": "<3"
+    }
+  ]
 }