Use Renovate recommended baseline (#3977)

Notice this was done upstream in
https://github.com/mastodon/mastodon/pull/26306 by one of the Renovate
people, so thought it would make sense here too

renovate.json

@@ -1,7 +1,7 @@
 {
     "$schema": "https://docs.renovatebot.com/renovate-schema.json",
     "extends": [
-        "config:base"
+        "config:recommended"
     ],
     "packageRules": [
         {