chore(renovate.json): fix configuration (#17)

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#### What this PR does / why we need it:

Allow major to be auto.

.github/renovate.json

@@ -4,7 +4,7 @@
   "dependencyDashboard": true,
   "dependencyDashboardAutoclose": false,
   "major": {
-    "dependencyDashboardApproval": true
+    "dependencyDashboardApproval": false
   },
   "rangeStrategy": "bump",
   "packageRules": [