[github-maintenance] Extend org Renovate config preset (#113)

Adds `local>marimo-team/.github:renovate-config` to the `extends` array
in `renovate.json`.

<!-- github-maintenance:hash=7fdcfb05:script=renovate-config-fix -->

Co-authored-by: marimo-github-maintenance-bot[bot] <267743655+marimo-github-maintenance-bot[bot]@users.noreply.github.com>

Author: marimo-github-maintenance-bot[bot]

renovate.json

@@ -1,6 +1,7 @@
 {
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
   "extends": [
+    "local>marimo-team/.github:renovate-config",
     "config:recommended"
   ]
-}
+}