Fix commitBody

Change-Id: I00c1c331220dbb16a4cd76a417ae695dfe7f8396
diff --git a/renovate.json b/renovate.json
index 84c98ec..adb0f44 100644
--- a/renovate.json
+++ b/renovate.json
@@ -2,7 +2,7 @@
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
   "extends": ["config:base"],
   "baseBranches": ["main", "/^stable\\/.*/"],
-  "commitMessageExtra": "Skip-Release-Notes",
+  "commitBody": "Skip-Release-Notes",
   "packageRules": [
     {
       "matchPackagePatterns": ["*"],