Switch to jenkinsci/renovate-config (#888)

Author: NotMyFault

.github/renovate.json

@@ -1,16 +1,8 @@
 {
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
   "extends": [
-    "config:recommended",
-    ":semanticCommitsDisabled",
+    "github>jenkinsci/renovate-config",
     "schedule:earlyMondays"
   ],
-  "automerge": true,
-  "reviewers": [
-    "team:core"
-  ],
-  "labels": [
-    "dependencies"
-  ],
-  "rebaseWhen": "conflicted"
+  "automerge": true
 }