fix(ci): renovate rebase conditions

renovate.json

@@ -2,5 +2,7 @@
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
   "automerge": true,
   "automergeStrategy": "merge-commit",
-  "automergeType": "pr"
+  "automergeType": "pr",
+  "rebaseLabel": "renovate/rebase",
+  "rebaseWhen": "behind-base-branch"
 }