ci: enable renovate lockFileMaintenance (#15593)

alan-agius4 · mgechev · commit 10493a225667 · 2019-09-18T14:50:39.000+01:00
See: https://docs.renovatebot.com/configuration-options/#lockfilemaintenance
diff --git a/renovate.json b/renovate.json
@@ -9,6 +9,9 @@
     "PR target: master-only"
   ],
   "timezone": "America/Tijuana",
+  "lockFileMaintenance": {
+    "enabled": true
+  },
   "schedule": [
     "after 10pm every weekday",
     "before 4am every weekday",
