Use personal address before creating a bot account

renovate.json

 {
   "branchPrefix": "renovate/",
   "username": "ggrossetie",
-  "gitAuthor": "Renovate Bot <bot@renovateapp.com>",
+  "gitAuthor": "Guillaume Grossetie <ggrossetie@gmail.com>",
   "platform": "gitlab",
   "separateMajorMinor": true,
   "extends": [